KR101728755B1 - Air heating apparatus and drier having the same - Google Patents

Abstract

The present invention provides an outside-air heating apparatus. The outside-air heating apparatus includes a back duct communicating with the drum of the dryer and blowing outside air at a predetermined temperature from the outside; And a heater disposed at a predetermined distance from the inner wall of the back duct and heating the outside air to a predetermined heating temperature. The present invention also provides a dryer having the above-mentioned outdoor air heating device. Therefore, the present invention can establish a flow boundary capable of supplying heated air into the inside of the dryer without heat source loss of the heater that heats the outside air.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an air heating apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer, and more particularly, to an outside-air heating apparatus capable of supplying heated air into a dryer without loss of a heat source of a heater for heating the outside air and a dryer having the same.

Typically, the dryer is a device for drying the object to be dried by blowing the hot air generated by the heater into the rotary drum to absorb moisture of the object to be dried (for example, clothing in a state of being completely washed).

The dryer is roughly classified into an exhaust type dryer and a condensation type dryer depending on a treatment method of a humidifier containing moisture generated by drying the object to be dried. In detail, the exhaust type dryer uses a method of discharging the moisture vapor discharged from the drum to the outside of the dryer, and the condenser dryer condenses the moisture vapor discharged from the drum in a heat exchanger to remove moisture, The air is heated again and sent to the drum for recirculation.

Among them, the exhaust type dryer sucks the outside air outside the dryer by the operation of the fan, and after heating the sucked outside air to a predetermined temperature by using a heater such as a heater, the hot air is supplied into the rotating drum do.

Therefore, the object to be dried stored in the rotating drum can be dried by the high-temperature air, and the inside of the drum is filled with the middle-temperature and high-humidity air generated during the drying.

This warm and humid air is exhausted to the outside through an exhaust duct communicating with the drum.

Here, the conventional heater is installed inside a back duct connected to the rear end of the drum to introduce the outside air into the inside of the drum. In the conventional art, the heater and the inner wall of the back duct are closely contacted with each other in the back duct.

Therefore, the outside air flowing from the outside of the dryer flows after passing through only the heater itself, and flows into the inside of the drum.

At this time, the conventional heater heats the incoming outdoor air, but the heat generated during the heating is lost through the back duct closely attached to the outer periphery. Therefore, conventionally, there is a problem in that electric energy generated when the heater is driven can not be fully applied to the outside air and is lost to the outside, which is a major cause of energy waste.

Further, in the related art, there is a problem that the temperature rise of the back duct itself, which supplies the heated air into the dryer drum, can not be suppressed, resulting in a device failure due to an increase in the temperature of the entire dryer.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a drum type heating apparatus which minimizes loss of a heat source generated in a heater, And to provide a dryer having the same.

It is another object of the present invention to provide an outside air heating device for forming a heat insulating layer capable of separating a flow of air heated by a heater from an inside wall of a predetermined distance duct, and a dryer having the same.

It is another object of the present invention to provide an outside-air heating apparatus capable of preventing a problem such as a device failure due to a rise in the temperature of the entire dryer by suppressing a temperature rise of the back-duct itself supplying the heated air into the dryer drum, Dryer.

In one aspect, the present invention provides an ambient air heating apparatus that forms a flow boundary.

The outside air heating device constituting the flow boundary is communicated with the inside of the drum of the dryer, and the back duct blows outside air at a predetermined temperature from the outside. And a heater disposed at a predetermined distance from the inner wall of the back duct and heating the ambient air to a predetermined heating temperature.

The outer circumferential surface of the heater and the inner circumferential surface of the back duct may be formed to correspond to each other at a certain distance from each other.

In addition, the spacing distance is preferably proportional to the thickness of the back duct.

Preferably, the heater includes a heat source for heating the outside air and a case for surrounding the heat source along the back duct.

Here, the spaced distance is substantially a distance between an outer peripheral surface of the case and an inner wall surface of the back duct.

Further, a blade extending a certain length toward the inner wall of the back duct may be further formed on the outer periphery of the end of the heater on the blown side.

Here, the blade may be detachably attached to the outer periphery of the end of the heater.

The heat insulating layer having a flow cross-sectional area between the outer periphery of the heater and the inner wall of the back duct may be formed as a flow boundary layer at a distance from the inner wall side of the back duct along the dryer drum side.

In another aspect, the present invention provides an outside-air heating apparatus and a dryer having the same.

The dryer includes: a drum having a drying chamber for drying an object to be dried; A back duct communicating with the inside of the drum at a rear end of the drum and forming an outside air flow path at a predetermined temperature from the outside; A blowing fan for blowing the outside air into the drum; A heater disposed at a predetermined distance from the inner wall of the back duct and heating the outside air to a predetermined heating temperature; And an exhaust duct communicating with the inside of the drum at a front end of the drum, and exhausting the air after the drying of the laundry to the outside.

The outer circumferential surface of the heater and the inner circumferential surface of the back duct may be formed to correspond to each other at a certain distance from each other.

In addition, the spacing distance is preferably proportional to the thickness of the back duct.

Preferably, the heater includes a heat source for heating the outside air and a case for surrounding the heat source along the back duct.

Here, the spaced distance is substantially a distance between an outer peripheral surface of the case and an inner wall surface of the back duct.

Further, a blade extending a certain length toward the inner wall of the back duct may be further formed on the outer periphery of the end of the heater on the blown side.

Here, the blade may be detachably attached to the outer periphery of the end of the heater.

The heat insulating layer having a flow cross-sectional area between the outer periphery of the heater and the inner wall of the back duct may be formed as a flow boundary layer at a distance from the inner wall side of the back duct along the dryer drum side.

The present invention has the effect of supplying a heat source generated by a heater to the inside of the drum while minimizing the loss to the outside, when heated to a certain temperature and supplied into the dryer drum.

In addition, the present invention has the effect of forming a heat insulating layer capable of separating the flow of heated air passing through the heater from the inner wall of a certain distance duct.

Further, the present invention has an effect of preventing a problem such as a device failure due to a rise in the temperature of the entire dryer by suppressing the temperature rise of the back duct itself which supplies heated air into the dryer drum.

1 is a perspective view showing a schematic configuration of an outside-air heating apparatus of the present invention and a dryer having the same.
2A is an exploded perspective view showing an outside-air heating apparatus according to the present invention.
FIG. 2B is a perspective view showing a back duct portion of the outside-air heating apparatus of FIG. 2A.
Fig. 3 is a sectional view taken along the line I-I 'in Fig.
Figure 4 is a cross-sectional view showing the formation of a flow boundary layer in the back duct of Figure 3;
5 is a sectional view showing a back duct and a heater installed in the back duct according to the present invention.
6 is a cross-sectional view showing that a blade is installed in the heater of FIG.
7A is a sectional view showing that the heater according to the present invention is installed in the back duct by the support legs.
7B is a cross-sectional view taken along line II-II 'of FIG. 7A.
8A is a graph showing a temperature change when the effective distance d is formed between the inner wall surface of the conventional heater and the back duct.
8B is a graph showing a temperature change when the effective distance d is not formed between the inner wall surface of the heater and the back duct according to the present invention.

Hereinafter, an outside-air heating apparatus and a dryer having the same according to the present invention will be described with reference to the accompanying drawings.

Here, preferably, the outside-air heating apparatus may be employed in a dryer. Accordingly, the outside air heating apparatus will be described including the dryer. Of course, the outside-air heating apparatus can be easily adapted to other apparatuses requiring constant heating air in addition to the dryer.

Referring to FIG. 1, the dryer 1 of the present invention has a case 100 having a certain space therein. The case 100 is provided with a drum 200 rotated at a predetermined rotational speed through a rotating means (not shown).

The front end of the drum 200 may be opened and closed by a door (not shown) installed in the case 100. Inside the drum 200, a storage space for storing clothes such as clothes is formed. The rear end of the drum 200 is connected to the back duct 300 to be described later. Of course, the rear end of the drum 200 connected to the back duct 300 may be connected through a separate rotating mechanism (not shown) so as not to interfere with the rotation of the drum 200 itself.

The drum 200 on the front end of the drum 200 is connected to an exhaust duct 210 communicating with the outside. The exhaust duct 210 is provided with a fan 220 for discharging the air inside the drum to the outside.

The rear drum 200 of the drum 200 is connected to the back duct 300. Here, since the connection of the rear end of the drum 200 and the back duct 300 is described above, description thereof will be omitted.

Here, the back duct 300 is connected to an intake duct 500 communicating with the outside air, and the air intake duct 500 is provided with a blowing fan 600 blowing outside air into the back duct 300.

2A and 2B, according to an embodiment of the present invention, the back duct 300 has a connection port 311 connected to the intake duct 500 at one end thereof, and a back duct 300 The upper back duct 310 is formed with an opening 312 for exposing the inside of the back duct 300 and the lower back duct 320 is connected to the upper back duct 310 to form an inner space of the back duct 300. . Here, the heater 400 is installed in the back duct 300. A description of the heater 400 will be described below. Here, the exposing port 312 may be provided with a filter that can filter the foreign substances contained in the outside air inside the back duct 300 and supply the foreign substances to the inside of the drum 200.

- heater-

A heater 400 is installed in the back duct 300 at a predetermined distance from the inner wall of the back duct 300 and heats the outside air to a predetermined heating temperature. Here, the distance between the heater 400 and the inner wall of the back duct 300 is referred to as an effective distance d (see FIG. 5). The effective distance d may be variable.

A state in which the heater 400 is installed inside the back duct 300 will be described with reference to FIGS.

First, the structure of the heater 400 will be described.

Referring to FIG. 5, the heater 400 includes a case 410 having both open sides and a predetermined space formed therein, and a heat source 420 heated to a predetermined temperature by receiving power from the outside. The heat source 420 may be formed in a coil shape so as to easily maintain the flow of outside air blown from the outside. Here, the case 410 may be made of a material having a low thermal conductivity.

The outer circumferential surface of the case 410 and the inner wall surface of the back duct 300 have a certain distance, that is, an effective distance d. That is, the heater 400 is installed inside the back duct 300, and a gap corresponding to the effective distance d is formed between the outer circumference of the back duct 300 to form another channel (2).

The outer circumferential surface of the case 410 and the inner wall surface of the back duct 300 may have a shape corresponding to each other. This allows another channel (2) formed on the outer periphery of the heater 400 to have a constant flow cross-sectional area.

4, when the outside air flows into the back duct 300 due to the operation of the air blowing fan 600, the outside air flows to the drum 200 side through the two passages (1, 2) .

Here, one of the flow paths (1) is a first flow path (1) through the internal heat source 420 of the heater 400 and the other is a case 410 of the heater 400 and a back flow path 300 formed between the inner wall surfaces of the first and second plates. Accordingly, the first flow path (1) and the second flow path (2) can form independent flow paths having different temperature environments.

The outside air flowing into the back duct 300 is heated to a predetermined temperature while passing through the first flow path (1). The other outside air passes through the second flow path (2) .

For example, when the outside air flowing into the back duct 300 is 40 to 50 degrees Celsius, the outside air passing through the first flow path (1) can be heated to a temperature of 200 to 300 degrees Celsius, The outside air passing through the flow path (2) may be relatively lower in temperature than the outside air passing through the first flow path (1) to a certain temperature.

Accordingly, as shown in FIGS. 3 and 4, a flow boundary layer a may be formed outside the heater 400 between the first flow path (1) and the second flow path (2). As described above, since the temperature of the outside air may be lower than the temperature of the second flow path () passing through the heat source 420, the flow boundary layer (a) .

A mixing part M in which the first flow path (1) and the second flow path (2) are mixed with each other may be formed at a position spaced a predetermined distance from the heater (400).

In the mixing part M, the outside air passing through the first flow path (1) and the outside air passing through the second flow path (2) are mixed with each other to flow into the drum 200 along the flow path of the back duct 300 .

Accordingly, in the present invention, between the outside air (or high temperature air) passing through the first flow path (1) in the back duct (300) and the outside air passing through the second flow path (a) are formed so that they can be separated from each other at a constant flow distance.

The second flow path (2) formed substantially outside the flow boundary layer (a) serves as a heat insulating layer to prevent the temperature of the first flow path (1) from being lost to the outside of the back duct (300).

That is, the high-temperature air can be prevented from being directly transmitted to the inner wall surface of the back duct 300 by the low-temperature air surrounding the boundary layer a. Accordingly, mutual heat transfer between the back duct 300 and the high-temperature air is reduced, and the loss of the outside air heated through the heat source 420 of the heater 400 can be remarkably reduced.

8A and 8B show a case where the effective distance d is formed between the heater 400 and the inner wall surface of the back duct 300. FIG 8B shows the case where the heater 400 and the back duct 300 have the effective distance d, And the effective distance d is not formed between the inner wall surfaces of the inner wall surfaces.

8A shows an example of the temperature change per hour at all five positions A, B, C, D, and E shown in FIG. 2B.

8A and 8B as a whole, when the effective distance d between the inner wall of the back duct 300 and the heater 400 exists, the temperature at the five positions is lower than the temperature shown in FIG. 8B It can be seen that it drops by about 20 degrees.

That is, in the case of FIG. 8A, since the high temperature air heated by the heater 400 does not directly transfer heat to the outer circumference of the back duct 300, the heat loss of the high temperature air blown into the drum 200 is reduced In the case of FIG. 8B, since the high temperature air heated by the heater 400 directly transfers heat to the back duct 300, the heat loss of the high temperature air blown into the drum 200 is increased.

In addition, since the flow of the hot air surrounds the flow of the low temperature air around the boundary layer (a) or the thermal boundary layer, the heat dissipation in the high temperature air can be efficiently minimized.

That is, the low-temperature air flow flowing along the second flow path (2) may serve as a heat insulating layer by preventing the heat of the high-temperature air from being dispersed to the outside.

Meanwhile, the effective distance d according to the present invention is preferably formed in inverse proportion to the thickness of the back duct 300.

That is, when the thickness of the back duct 300 has a first thickness which is greater than a predetermined value, the effective distance, which is a distance from the heater 400, may be shorter than a predetermined first effective distance. On the other hand, when the thickness of the back duct 300 has a second thickness that is thinner than the first thickness, the effective distance may be a second effective distance that is longer than the first effective distance.

Although the length of the back duct 300 is set based on the thickness of the back duct 300 and the effective distance is set, the length, thickness, and width of the back duct 300, And the size of the heater 400 are considered.

-blade-

6, a blade 430 may further be disposed at a rear end of the heater 400 according to the present invention.

Accordingly, the blade 430 extends a certain length toward the inner wall surface of the back duct 300, as shown in FIG.

Here, the blade 430 may reduce the amount of outside air flowing into the second flow path (2) to a certain amount or less. This can indirectly adjust the effective distance d between the outer circumferential surface of the case 410 of the heater 400 and the inner wall surface of the back duct 300 only by adjusting the inflow amount of the outside air through the blades without physically adjusting the distance d.

In addition, the outer surface of the blade 430 may be formed as an inclined surface 431 to prevent a wake of the flow path flowing into the second flow path (2). In addition, the inclined surface 431 may have a constant curvature.

Therefore, the outer air can be easily introduced into the second flow path (2) formed on the outer peripheral side of the heater 400 through the blade 430 by the inclined surface 431.

In addition, the blade 430 may be detachably attached to the rear end of the heater 400. The detachment method may be a bolt (B) fastening method or a hook-and-fast fitting method.

Accordingly, since various blades having different lengths of the inclined surfaces can be selectively attached to the rear end of the heater 400, the clearance between the end of the blade 430 and the inner wall surface of the back duct 300 can be easily adjusted have.

7A and 7B, the heater 400 may be supported by a plurality of support legs 450 in the back duct 300. [ In particular, the support legs 450 may be made of a material having a low heat transfer rate.

The support legs 450 have a predetermined length and are formed in a cylindrical shape. Here, the reason why the support legs 450 are formed in a cylindrical shape as described above is to minimize the interference with the external air flow flowing into the second flow path (2).

One end of the support leg 450 is connected to the outer circumference of the case 410 of the heater 400 and the other end is connected to the inner wall surface of the back duct 300. Accordingly, the heater 400 can be fixed at a predetermined position in the back duct 300.

Here, although not shown in the drawing, the other ends of the support legs 450 may be fixedly inserted into support grooves formed in the inner wall of the back duct 300, respectively.

1: dryer
100: Case
200: Drums
210: exhaust duct
300: back duct
400: heater
410: Case
420: heat source
430: blade
500: Intake duct
600: blowing fan
a: Flow boundary layer
d: effective distance
①: First Euro
②:

Claims (14)

The upper back duct is connected to the inside of the drum of the dryer. The upper back duct extends toward the intake duct to form a connecting port for sucking the outside air. A back duct having a lower back duct formed therein for blowing outside air introduced from the outside; And
And a heater disposed at a predetermined distance from the inner wall of the back duct in the inner space and heating the ambient air to a predetermined heating temperature,
The heater includes a heat source for heating the outside air and a case for surrounding the heat source along the back duct,
The outside air flowing into the back duct is formed to have a first flow path through which the internal heat source of the heater passes and a second flow path passing between the case and the inside wall surface of the back duct,
Wherein a flow boundary layer is formed between the first flow path and the second flow path to prevent hot air from directly contacting the inner wall surface of the back duct. The method according to claim 1,
Wherein the outer circumferential surface of the heater and the inner wall surface of the back duct are formed to correspond to each other at a predetermined distance from each other. The method according to claim 1,
Wherein the spacing distance is proportional to the thickness of the back duct. The method according to claim 1,
Wherein a distance between the heater and the back duct is a distance between an outer circumferential surface of the case and an inner wall surface of the back duct. The method according to claim 1,
Wherein a blade extending a certain length toward the inner wall of the back duct is further formed on the outer periphery of the end of the heater on the blown side. 6. The method of claim 5,
Wherein the blade is detachably attached to an outer periphery of an end of the heater. The method according to claim 1,
Wherein the heat insulating layer having a flow cross sectional area between the outer periphery of the heater and the inner wall of the back duct forms a flow boundary layer at a distance from the inner wall side of the back duct along the dryer drum side. A drum having a drying chamber for drying the laundry;
An upper back duct extending from the rear end of the drum to the inside of the drum and having a connection port extending toward the intake duct at one end for sucking the outside air and having a connection port for exposing the inside at the other end, A back duct having a lower back duct coupled to form an inner space, the back duct forming a flow path of the outside air introduced from the outside;
A blowing fan for blowing the outside air into the drum;
A heater disposed at a predetermined distance from the inner wall of the back duct and heating the outside air to a predetermined heating temperature; And
And an exhaust duct communicating with the inside of the drum at a front end of the drum and exhausting the air after drying the laundry,
The heater includes a heat source for heating the outside air and a case for surrounding the heat source along the back duct,
The outside air flowing into the back duct is formed to have a first flow path through which the internal heat source of the heater passes and a second flow path passing between the case and the inside wall surface of the back duct,
And a flow boundary layer formed between the first flow path and the second flow path to prevent hot air from directly contacting the inner wall surface of the back duct, and a dryer having the same. 9. The method of claim 8,
Wherein the outer peripheral surface of the heater and the inner wall surface of the back duct are formed to correspond to each other so as to have a certain distance from each other. 9. The method of claim 8,
Wherein the spacing distance is proportional to the thickness of the back duct, and the dryer having the same. 9. The method of claim 8,
Wherein a distance between the heater and the back duct is a distance between an outer circumferential surface of the case and an inner wall surface of the back duct. 9. The method of claim 8,
Wherein a blade is formed on the outer periphery of the end of the heater to extend a certain length toward the inner wall of the back duct. 13. The method of claim 12,
Wherein the blade is detachably attached to the outer periphery of an end of the heater, and a dryer having the same. 9. The method of claim 8,
Wherein the heat insulating layer having a flow cross sectional area between the outer periphery of the heater and the inner wall of the back duct forms a flow boundary layer at a distance from the inner wall side of the back duct along the dryer drum side.

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