KR101982609B1 - A drain module for an oven and the oven comprising the draing module - Google Patents

Abstract

The present invention relates to a drain module for an oven and an oven comprising the same, and more specifically, to a drain module for an oven and an oven comprising the same, which prevent debris contained in water from interrupting a circulation action when cleaning water used in an oven is discharged to the outside or circulated again to the oven. To this end, provided in the present invention are the drain module for an oven and the oven comprising the same, comprising: a drain container shaping the appearance; a first space unit disposed in the drain container to guide water therein to one side; a second space unit disposed to be partitioned from the first space unit, and disposed to accommodate the water moved along the first space unit; a discharge hole formed on the bottom of the second space unit, and guiding the water accommodated in the second space unit to be discharged to the outside; and a circulation opening unit arranged to be adjacent to the discharge hole in the second space unit, or arranged at a discharge pipe connected to the discharge hole, to guide the water accommodated in the second space unit to be discharged out of the drain container to be circulated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oven drain module and an oven having the oven drain module,

The present invention relates to an oven drainage module and an oven having the oven drainage module and an oven drainage module for preventing the foreign matter mixed with water from interfering with the circulation operation when the washing water used in the oven is discharged to the outside or circulated back to the oven. And an oven having the same.

As shown in Korean Patent Laid-Open No. 10-2010-0133064 (one-way washing), a steam oven for performing cooking using steam includes a cooking chamber and a convection chamber. And a steam generator for generating steam is provided at one side thereof.

When cooking is repeated many times, the inside of the washing machine needs to be cleaned due to contamination. In order to clean the washing machine, water is supplied from the outside to clean the inside of the washing machine. Since the outside water is used only once, There is a problem that water is wasted because a large amount of water is required to be completed.

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above object, and it is an object of the present invention to provide an oven which is capable of smoothly discharging foreign matter, And an oven including the oven drain module.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a sewage disposal apparatus comprising: a drainage passage forming an outer pipe; a first space portion provided in the drainage pipe to guide water therein; A second space portion provided to receive the water moved along the first space portion; A drain disposed at the bottom of the second space to guide the water contained in the second space to the outside;

And a circulation opening disposed adjacent to the drain hole in the second space portion or disposed in a drain pipe connected to the drain hole so as to guide the water stored in the second space portion to the outside of the drain hole and circulated And the oven drainage module is provided with an oven drainage module.

Wherein a bottom surface of the first space portion is inclined downward toward the second space portion and a bottom surface of the second space portion is formed to be lower than a bottom end of the bottom surface of the first space portion, And the second space is formed in a stepped shape so as to form a drop falling from the first space to the second space.

Wherein the circulation opening is disposed on a side surface of the second space portion and the bottom surface of the second space portion is inclined in a direction of a drain port so that the drain hole is formed on the bottom surface of the second space portion, And the circulation opening is disposed at a predetermined height apart from where the drain port is located.

And an overflow opening formed on the side of the drain tank and located at a position higher than the drain hole so as to discharge a predetermined level of water to the outside when the water contained in the drain tank becomes a certain level or more .

The overflow opening is connected to an overflow pipe connected to a drain pipe. The opening for circulation is connected to a circulation pipe connected to a circulation pump. The circulation pipe is connected to a drain pipe, Is characterized by being connected

According to another aspect of the present invention, there is provided a vacuum cleaner comprising: a housing having a convection chamber; A convection fan and a heat source provided in the convection chamber; A circulation water discharge nozzle provided at an upper portion of the cooking chamber; A cooking chamber drain port provided on the lower surface of the cooking chamber to discharge water inside the cooking chamber to the outside of the cooking chamber; And an oven drain module connected to the circulation water discharge nozzle connected to the cooking chamber drain hole to selectively drain the water to the outside or circulate the water to the inside of the cooking chamber again,

The oven drain module comprises: Drainage passage forming an appearance;

A first space portion provided in the drain tube and configured to guide the water inside the drain tube to one side; A second space part provided to be separated from the first space part and adapted to receive the water moved along the first space part; A drain disposed at the bottom of the second space to guide the water contained in the second space to the outside;

And a circulation opening disposed adjacent to the drain hole in the second space portion or disposed in a drain pipe connected to the drain hole so as to guide the water stored in the second space portion to the outside of the drain hole and circulated And an oven drainage module for ovens.

Wherein the drain port is connected to a drain pipe, and a drain valve is provided in the drain pipe, the drain valve being a motor-operated valve for opening and closing a drain pipe, and a circulation pump is connected to the circulation pipe, wherein a circulation pipe arrangement from the circulation opening to the inlet of the circulation pump The height of the circulation pump is increased from the circulation opening toward the inlet of the circulation pump.

Wherein a bottom surface of the first space portion is inclined downward toward the second space portion and a bottom surface of the second space portion is formed to be lower than a bottom end of the bottom surface of the first space portion, And the second space is formed in a stepped shape so as to form a drop falling from the first space to the second space.

The circulation opening may be disposed on a side surface of the second space, and the bottom surface of the second space may be inclined in a direction toward the drain port, And the circulation opening is disposed at a predetermined height in a vertical direction at a position where the drain port is located.

An overflow opening formed in a side surface of the drain tank and located at a higher position than the drain hole and configured to discharge water having a predetermined level to the outside when the water contained in the housing becomes a certain level or more;

And an overflow pipe connected to the overflow opening and the drain pipe to guide the overflowed water toward the drain pipe.

According to the present invention, since the drain port and the circulation opening are provided adjacent to each other, the foreign matter in the vicinity of the circulation opening or inside the circulation pipe can easily move toward the drain port when draining through the drain port, So that it is possible to prevent the operation failure of the circulation pump due to the foreign matter.

In addition, by partitioning the first space part and the second space part and providing the second space part in the form of a pocket, it is possible to easily collect water and foreign matter in the second space part, By providing the opening, drainage and circulation of water can be facilitated.

The bottom surface of the first space is inclined so that the water can be easily moved to the second space. The bottom surface of the second space is inclined toward the drain port so that water remaining on the bottom of the second space So that the foreign matter can be easily moved toward the drain port.

1 is a side cross-sectional view of an oven according to the present invention.
2 is a perspective view of a drainage module according to the present invention.
3 is a side sectional view and a front sectional view of the drainage bin according to the present invention.
4 is a plan view of the water drainage tube according to the present invention.
5 is a view showing a state in which water and foreign matter are contained in a drainage bin according to the present invention.
6 is a view showing a state in which water and foreign matter are discharged into the drainage bin according to the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms.

The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

 Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1, the oven 10 according to the present invention includes an outer housing 11 forming an outer appearance and an inner housing 12 provided inside the outer housing 11 to form a cooking chamber 13 do. A convection chamber 14 is provided at one side of the cooking chamber 13 of the inner housing 12 and a driving motor 16 for driving the convection fan 15, ).

Where the heat source may be a convection heater, or a gas heat exchanger other than a heater, or any component capable of providing other heat.

Between the convection chamber 14 and the cooking chamber 13, a perforated partition is provided so that the hot air from the convection chamber 14 can be moved to the cooking chamber.

The drainage module 100 including the drainage tube 110 is connected to the drainage hole 12a and the drainage module 100 is connected to the circulation pipes 151 and 152, And the circulation pipes 151 and 152 are connected to the wash water discharge nozzle 152a on the upper portion of the cooking chamber 13. [

As described later, according to the operation of the drainage module 100, the water inside the drainage can completely escape to the outside, or it rides up the circulation pipes 151 and 152 and flows through the wash water discharge nozzle 152a It is sprayed into the cooking chamber 13 and the inside of the cooking chamber 13 can be cleaned.

Although not shown, a steam generator (not shown) is provided outside the inner housing 12 and housed in the outer housing 11. The steam generator can be a boiler system that is supplied with water (direct water) supplied from the outside and boiled by using a heat source to generate steam, or the direct water is directly supplied to the heat source (17) to evaporate water by hot heat, Can be generated.

Hereinafter, an oven drainage module (hereinafter referred to as 'drainage module') 100, which is an important component of the present invention, will be described with reference to FIGS. 1 and 2. FIG.

The drainage module 100 includes a drainage pipe 110, drainage pipes 141 and 142 connected to the drainage pipe 110, a drainage valve 140 for opening and closing the drainage pipes 141 and 142, A circulation pump 150 connected to the circulation pipes 151 and 152 and circulating pipes 151 and 152 for sucking the water into the cooking chamber 13 by the circulation pipes 151 and 152, And an air discharge pipe 162 for discharging hot air inside the drain canister 110 to the outside.

The inlet port 117 connected to the drain port 12a of the cooking chamber 13 is provided at the rear of the upper surface plate 116. As shown in FIG. The inside of the drain can 110 may be divided into a first space 121 and a second space 122. The function of the first space 121 is to ensure that the water discharged from the cooking chamber 13 is smooth And guide the user to move to the second space unit 122.

The bottom portion 111 of the first space portion 121 is inclined downwardly toward the second space portion 122 so that the foreign substances contained in the water are supplied to the bottom portion 111 of the first space portion 121 Thereby preventing it from remaining.

The second space portion 122 is disposed in front of the first space portion 121. The second space portion 122 plays a role of receiving or storing water to be discharged or to be circulated. The bottom surface of the second space portion 122 may be formed on the bottom surface of the first space portion 121 in order to prevent water or foreign matter contained in the second space portion 122 from flowing back to the first space portion 121. [ It should be lower than the lowest part.

2 and 3, the second space portion 122 is provided in the form of a pocket forming a stepped portion in a stepped shape relative to the first space portion 121. However, May also be used.

A drain port 131 is provided on the bottom surface of the second space portion 122 and a circulation opening portion 132 is provided on the front side wall 113 of the second space portion 122. Here, the drain port 131 and the circulation opening 132 are disposed adjacent to each other, and the drain port 131 is inclined in a horizontal state or a horizontal state, and the circulation opening 132 is in an upright state Vertical state) so that they can be arranged in an 'a' shape.

However, the arrangement of the drain port 131 is not limited to the horizontal state, and the arrangement of the circulation opening 132 is not limited to the vertical state. If the circulation opening 132 is positioned higher than the drain port 131, It is possible to make a shape.

In this case, the circulation opening 132 is formed at one side of the drain pipe 141 connected to the drain port 131. In this case, the circulation opening 132 is formed at one side of the drain pipe 141, The circulation pipe 151 connected to the drain pipe 141 is connected to the drain pipe 141.

The drain port 131 is connected to the drain pipes 151 and 152. The drain pipes 151 and 152 include a first drain pipe 141 connected to the inlet of the drain valve 140 and a second drain pipe 141 connected to the outlet of the drain valve 140 And a second drain pipe 142. Here, the drain valve 140 is provided as an electric valve and is preferably implemented as a two-way valve or other manner (e.g., a three-way system).

Here, the drain valve is preferably composed of a valve body 145 composed of a valve, and a driving unit 146 connected to the valve body 145 to drive the valve, but the present invention is not limited thereto.

On the other hand, an overflow opening 133 is provided at one side of the second space portion 122, an overflow pipe 143 is connected to the overflow opening 133, and an overflow pipe 143 is connected to the second And is connected to a drain pipe 142.

The overflow opening 133 and the overflow pipe 143 are connected to one side of the second space portion 122 so that a tube of an upright shape is inserted into the second space portion 122 to complicate the internal structure It is possible to increase the utilization of the internal space.

Also, by placing the overflow pipe 143 side-by-side, the overflowed water can directly pass through the overflow pipe 143 and escape to the outside through the second water pipe 143. The area of the overflow pipe 143 connected to the second drain pipe 142 is preferably formed to be inclined downward toward the second drain pipe 142. However, the shape and arrangement of the overflow pipe are not limited to this, and various types of bending and positioning are possible. The overflow opening portion 133 may be formed to protrude upward in the drainage tube 110 to discharge the water to the outside, and the overflow opening portion 133 may be formed in the first space portion 122 other than the second space portion 122, (Not shown).

The circulation pipes 151 and 152 are connected to the circulation opening 132. The circulation pipes 151 and 152 include a first circulation pipe 151 connected to the inlet of the circulation pump 150, 150) connected to the outlet of the second circulation pipe (152). And the second circulation pipe 152 extends upward and is connected to the above-described water discharge nozzle 152a.

The circulation pump 150 is divided into a pump unit 154 including a pump housing and an impeller rotating therein and a driving unit 153 rotating the impeller in the pump unit 154. The impeller includes a plurality of blades And a lower disk provided at a lower portion of the blade.

However, the shape of the impeller is not limited thereto.

On the other hand, a direct water pipe 161 is provided at one side of the drain can 110 to supply external direct water for cooling when the temperature inside the drain canister 110 is too hot. On the upper surface of the drain can 110, 162 are provided, and hot air can be discharged to the outside.

As shown in FIG. 3 (a), the shape and spatial characteristics of the first space portion 121 and the second space portion 122 can be clearly distinguished from each other. As described above, the first space portion 121 is inclined downward toward the front and is directed toward the second space portion 122, so that the water (washing water) that has entered through the inlet 117 and the foreign matter sweeping therefrom are efficiently and quickly And guides the second space portion 122 toward the second space portion 122.

The second space portion 122 includes a first space portion 121 and a second space portion 121. The first space portion 121 is provided with a rear plate 115 such as a step or a cliff for forming a drop, And is provided in the form of a communicating pocket.

A drain port 131 is provided on the bottom surface of the second space portion 122 and a circulation opening 132 is provided on the front plate 113. Here, it is preferable that the circulation opening 132 does not start directly from the bottom surface of the second space portion 122 but is slightly spaced upward, in order to prevent a large amount of foreign substances accumulated on the bottom surface from being introduced .

The drain port 131 is preferably disposed immediately adjacent to the circulation opening 132 so that the center of the circulation opening 132 and the drain port 131 as viewed from the front as shown in FIG. Are arranged on the same line.

The reason why the center of the drain port 131 and the circulation opening 132 are aligned and arranged adjacent to each other is as follows. When the drain valve 140 is drained due to the opening of the drain valve 140, So as to prevent the foreign substances from entering the circulation pump 150. In order to prevent the foreign substances from entering the circulation pump 150,

If a foreign substance (such as a food waste cake) having a predetermined size or more flows into the circulation pump 150, it interferes between the impeller and the pump housing to obstruct the operation of the pump.

On the other hand, when the filter is installed at the inlet of the circulation opening 132, it is possible to prevent foreign matter from flowing into the filter. However, there is a problem that minute foreign matter is caught between the pores of the filter and clogs the filter itself.

Therefore, it is difficult to install the filter and it is preferable to remove the influence of the foreign material on the pump by using the water pressure sucking in the direction of the drain port 131 in order to prevent the foreign matter from entering the circulation pump 150, It can be said that

On the other hand, in order to make it difficult for the foreign matter to continue to enter the circulation pump even if the foreign matter passes through the circulation opening 132 and enters the first drain pipe 151 slightly, the first circulation pipe 151 is connected to the circulation pump inlet It is preferable to arrange it in an upward sloping direction.

The bottom of the second space portion 122 is formed with a downwardly inclined surface directed toward the drain port 131 so that water or foreign matter remaining in the lower area of the second space portion 122 smoothly moves toward the drain port 131 It is desirable to help drainage.

As shown in FIG. 3 (b), the bottom portion 114 of the second space portion 122 is provided in an inclined form inclined toward the drain port 131 rather than being flat, It is preferable that the drain port 131 is located and the circulation opening 132 is provided on the drain port 131. [ The foreign matter and water remaining in the second space portion 122 as a whole are smoothly moved in the direction of the drain port 131.

Therefore, it is preferable that the drain hole 131 and the circulation opening 132 are formed to be completely offset from one end of the second space portion 122.

4, the side wall 112 forming the first space part 121 of the side wall of the drain hole 110 is formed straight in the front-rear direction so that the width of the first space part 121 However, as indicated by a dotted line, the left and right widths may become wider from the rear to the front, and the left and right widths may be constant if the width is increased to some extent.

The change in width, such as the dotted line, is to further prevent water or foreign matter from remaining in the side wall 112 ', and the water and foreign matter flowing into the inlet are spread to the left and right, So as to push it out efficiently.

Hereinafter, the operation of the present invention will be described with reference to the accompanying drawings.

As shown in Figs. 1 and 5, after cooking is finished in the cooking chamber 13, external direct water (constant) is supplied through the nozzle to the inside of the cooking chamber 13 for cleaning the inside of the cooking chamber 13. [

Although not shown, a separate direct water pipe (not shown) capable of supplying an external direct water (constant) is connected to the direct water discharge nozzle 152a. When the valve in the direct water pipe is opened, Is discharged into the cooking chamber (13) by the wash water discharge nozzle (152a).

Thus, the foreign matter on the top, bottom, and side surfaces of the cooking chamber 13 is washed, falls to the bottom of the cooking chamber 13, and escapes to the drain port 12a on the bottom surface of the cooking chamber 13. [ Since the drain hole 12a is connected to the inlet 117 of the drain tank 110, a mixture of the water W and the foreign matter D is filled in the drain tank 110.

Part of the foreign matter D accumulated in the second space portion 122 may be accumulated at the inlet of the first circulation pipe 151 through the circulation opening 132 when the amount of foreign matter is large.

In the initial state, since there are many foreign substances, circulation of the foreign substances causes foreign matter to be caught in the circulation pump 150, causing a problem. Therefore, it is necessary to discharge foreign matter at an early stage. To this end, when the drain valve 140 is opened, water and foreign matter pass through the drain port 131 and are discharged downward as shown in FIG.

At this time, foreign matter and water near the circulation opening 132 and at the entrance of the first circulation pipe 151 can be quickly and efficiently moved toward the drain port 132 and discharged.

Particularly, as described above, since the position of the circulation opening 132 is located in the vicinity of the drain port 131 and the position of the central portion thereof is at the same position on the vertical line, The force can easily reach the vicinity of the circulation opening 132 and the inside thereof.

In addition, since the first circulation pipe 151 connected to the circulation opening 132 is inclined upward, the movement of the foreign matter D in the direction of the circulation pump 150 is restricted. The foreign matter D in the vicinity of the circulation opening 132 and the inside of the circulation opening 132 can easily escape from the circulation opening 132 and the first circulation pipe 151 by the water pressure.

When the direct water is directly supplied to the cooking chamber 13 to clean the inside of the cooking chamber 13 and the water W and foreign matter D introduced into the drainage module 100 are discharged a plurality of times, Can be removed from inside the galley and inside the drain module and from the galley.

That is, the preliminary cleaning is performed through open-loop method such as direct water supply, foreign matter removal and external discharge. However, in order to thoroughly clean the cooking chamber 13 by such a washing method, a large amount of direct water must be supplied and consumed. Therefore, there is a need for a method of saving water and perfecting the washing.

In the present invention, initially, an open-loop system is used to perform the initial cleaning, and thereafter, the closed-loop system is cleaned using the circulation pump 150.

Therefore, if such cleaning is performed a plurality of times experimentally, the foreign matter D in the interior is substantially removed, and there is no foreign matter or floating matters, or only a small amount is left. The operation of the circulation pump 150 is not obstructed at all.

Therefore, when the pre-set number of times of pre-cleaning is completed, the drain valve 140 is closed and the direct water is once again supplied to the inside of the drain tank 110 after passing through the cooking chamber 13, 110).

When the circulation pump 150 is operated in this state, the water W filling the second space portion 122 and the first space portion 121 is supplied through the first circulation pipe 151 to the circulation pump 150, rides on the second circulation pipe 152, and is sprayed into the cooking chamber by the wash water spray nozzle 152a. By repeatedly repeating this process, the inside of the cooking chamber 13 can be cleaned while circulating a limited amount of water.

When the predetermined time has elapsed, the operation of the circulation pump 150 is stopped and the drain valve 140 is opened to discharge the water used for cleaning to the outside, thereby completing the cleaning of the inside of the cooking chamber 13.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated that one embodiment is possible.

Accordingly, the true scope of the present invention should be determined by the technical idea of the claims.

13: a cooking chamber 12a: a drain
100: drain module 110: drain
121: first space part 122: second space part
131: drain (drain) 132: opening for circulation
132: overflow opening 140: drain valve
150: circulation pump

Claims (10)

Drainage passage forming an appearance;
A first space portion provided in the drain tube and configured to guide the water inside the drain tube to one side;
A second space part provided in the water drain tube together with the first space part, the second space part being provided to be separated from the first space part and adapted to receive water moved along the first space part;
A drain disposed at the bottom of the second space to guide the water contained in the second space to the outside;
And a circulation opening disposed adjacent to the drain hole of the second space and guiding the water contained in the second space to flow out of the drain hole and circulated,
The circulation opening and the drain port are separated and separated from each other in the second space,
Wherein a bottom surface of the first space portion is inclined downward toward the second space portion and a bottom surface of the second space portion is formed to be lower than a bottom end of the bottom surface of the first space portion, And the second space portion is provided in the form of a pocket to form a drop falling from the first space portion to the second space portion,
Wherein an arrangement height of the circulation opening is higher than that of the drain hole,
Wherein the circulation opening is disposed on a side surface of the second space portion,
The bottom surface of the second space portion is inclined in the direction of the drain port so that the drain port is located at the lowest one of the bottom surfaces of the second space portion,
Wherein the circulation opening is spaced a predetermined distance apart from where the drain port is located. delete delete The method according to claim 1,
And an overflow opening formed on the side of the drain tank and located at a position higher than the drain hole so as to discharge a predetermined level of water to the outside when the water contained in the drain tank becomes a certain level or more And the oven drainage module. 5. The method of claim 4,
The drain port is connected to a drain pipe, the drain pipe is opened and closed by a drain valve implemented as an electric valve,
Wherein the overflow opening is connected to an overflow pipe connected to a drain pipe,
Wherein the circulation opening is connected to a circulation pipe connected to the circulation pump. A housing having a cooking chamber and a convection chamber;
A convection fan and a heat source provided in the convection chamber;
A circulation water discharge nozzle provided at an upper portion of the cooking chamber;
A cooking chamber drain port provided on the lower surface of the cooking chamber to discharge water inside the cooking chamber to the outside of the cooking chamber;
And an oven drain module connected to the circulation water discharge nozzle connected to the cooking chamber drain hole to selectively drain the water to the outside or circulate the water to the inside of the cooking chamber again,
The oven drain module comprises:
Drainage passage forming an appearance;
A first space portion provided in the drain tube and configured to guide the water inside the drain tube to one side;
A second space part provided in the water drain tube together with the first space part, the second space part being provided to be separated from the first space part and adapted to receive water moved along the first space part;
A drain disposed at the bottom of the second space to guide the water contained in the second space to the outside;
And a circulation opening disposed adjacent to the drain hole of the second space and guiding the water contained in the second space to flow out of the drain hole and circulated,
The circulation opening and the drain port are separated and separated from each other in the second space,
Wherein a bottom surface of the first space portion is inclined downward toward the second space portion and a bottom surface of the second space portion is formed to be lower than a bottom end of the bottom surface of the first space portion, And the second space portion is provided in the form of a pocket to form a drop falling from the first space portion to the second space portion,
Wherein an arrangement height of the circulation opening is higher than that of the drain hole,
Wherein the circulation opening is disposed on a side surface of the second space portion,
The bottom surface of the second space portion is inclined in the direction of the drain port so that the drain port is located at the lowest one of the bottom surfaces of the second space portion,
Wherein the circulation opening is spaced apart from the drain hole by a predetermined height. The method according to claim 6,
Wherein the drain port is connected to the drain pipe, and the drain pipe is provided with a drain valve implemented as an electric valve for opening and closing the drain pipe,
Wherein a circulation pump is connected to the circulation pipe and an arrangement height of the circulation pipe from the circulation opening to the inlet of the circulation pump is formed to be higher toward the inlet of the circulation pump than the circulation opening. Oven. delete delete The method according to claim 6,
An overflow opening formed in a side surface of the drain tank and located at a higher position than the drain hole and configured to discharge water having a predetermined level to the outside when the water contained in the housing becomes a certain level or more;
And an overflow pipe connected to the overflow opening and the drain pipe to guide the overflowed water toward the drain pipe.

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