KR20190142090A - Steam generating apparatus and cooking device having the same - Google Patents

Abstract

According to an embodiment of the present invention, a steam supply apparatus includes: a steam supply part including a case of a casting material including a cylindrical steam generation part extended in a vertical direction, and a heater embedded in the case and extended in a longitudinal direction of the steam generation part from a spot spaced from the steam generation part to both lateral sides; a steam supply flow path including a first flow path extended from the steam generation part, and a second flow path branched from the first flow path to be connected to a cooking chamber; and a collection part connected to an end of the first flow path to collect condensate water in the steam supply flow path. The collection part includes: a housing storing condensate water therein; and a water level sensor mounted on the upper surface of the housing to be extended into the housing. A prevention part is dented on the upper surface of the housing to prevent the condensate water flowing into the housing along the first flow path from flowing to the water level sensor.

Description

Steam generating apparatus and cooking device having the same {Steam generating apparatus and cooking device having the same}

The present invention relates to a steam supply device and a cooking apparatus having the same.

A cooking appliance including an oven is a home appliance that cooks food using heat. Recently, a cooking apparatus equipped with a steam supply device has been introduced to provide a steam into a cooking chamber to increase the texture of food and minimize the destruction of nutrients contained in the food.

In order to maximize the steam generating efficiency of the steam supply device, the heat transfer pattern according to the shape of the steam generating unit and the position of the heater is very important factor.

In addition, the water level in the steam generator maintained at a constant level during the operation of the steam supply device not only significantly affects the steam generation efficiency, but also minimizes the amount of discharge water that springs up during steam generation and secures reliability through temperature control of the steam generator. It is a very important factor.

Korean Patent Publication No. 10-2018-0028643 (March 19, 2018)

An object of the present invention is to provide a cooking apparatus capable of maximizing steam generation efficiency by improving and optimizing the shape of a steam supply unit for generating steam and supplying it into a cooking chamber.

Steam supply apparatus according to an embodiment of the present invention for achieving the above object, the case of the casting material is formed with a steam generator in the form of a cylinder extending in the vertical direction, embedded in the case, the steam generation A steam supply unit including a heater extending in the longitudinal direction of the steam generating unit at points spaced apart from both sides from the unit; A steam supply flow path including a first flow path extending from the steam generator and a second flow path branched from the first flow path and connected to the cooking chamber; And a recovery part connected to an end of the first flow path to recover the condensed water in the steam supply flow path, wherein the recovery part is mounted on the upper surface of the housing, the housing storing the condensed water therein, and extending into the housing. And a water level sensor, wherein an upper portion of the housing has a depression formed therein to prevent condensate flowing into the housing along the first flow path to the water level sensor.

In addition, the cooking apparatus according to the embodiment of the present invention is characterized in that the steam supply device is mounted on the rear surface of the cavity.

Cooking device according to an embodiment of the present invention has the following advantages.

First, the steam generator is formed in a cylindrical shape extending vertically, the heater is extended in the longitudinal direction of the steam generator from both sides of the steam generator, it is possible to maximize the heat transfer to the steam generator.

Second, since the heater is embedded in the case in which the steam generator is formed, and the case is formed of a casting type, the heat transfer effect is better.

Third, according to the structure of the steam supply unit according to the embodiment of the present invention, it is possible to minimize the generation of discharge water while maximizing the steam generation efficiency, there is an advantage that the reliability of the steam generator is effectively secured.

Fourth, the recovery unit for recovering the condensed water generated along the steam supply flow path is mounted on the outside of the steam supply unit, and has a structure that can supply the discharge water and condensed water generated in the steam supply process to the steam generating unit, water The size of the tank can be designed compactly, there is an advantage that does not need a discharge passage for discharging the condensate collected in the recovery unit to the outside of the cooking apparatus.

According to this structure, since the water level in the recovery unit corresponds to the water level in the steam generation unit, there is an advantage that the water level sensor may be mounted in the recovery unit without directly mounting the high temperature steam generation unit.

Fifth, there is an advantage that the life of the water level sensor is secured by mounting an electrode type water level sensor that withstands high temperature well in order to detect the water level in the steam generating unit.

Sixth, the electrode type water level sensor is mounted on the upper surface of the recovery unit housing, and the common electrode and the operation electrode are separately disposed on both sides of the steam supply flow path connected to the housing, thereby minimizing the possibility of malfunction and noise occurrence of the water level sensor. There is an advantage.

Seventh, there is an advantage that the malfunction of the sensor can be minimized by Teflon coating treatment on the end of the electrode constituting the water level sensor.

Eighth, by forming a condensate inflow prevention portion in the form of a depression on the upper surface of the recovery unit housing corresponding to the electrode constituting the water level sensor to prevent the condensed water flowing along the steam supply flow path to the electrode of the water level sensor. There are advantages to it.

Ninth, a connection flow passage communicating with the cooking chamber is formed at one point of the steam supply flow path connecting the housing of the steam generation part and the recovery part, so that the pressure inside the housing of the steam generation part and the recovery part is maintained at atmospheric pressure in the water supply process. Therefore, there is an advantage that the configuration is required in the prior art, that is, there is no need for a vent hole or a pipe for pressure drop to maintain the inside of the housing of the recovery portion at atmospheric pressure.

1 is a rear perspective view of a cooking appliance according to an embodiment of the present invention;
2 is a left perspective view of a steam supply device according to an embodiment of the present invention;
3 is a right perspective view of the steam supply device;
Figure 4 is a side cross-sectional view of the steam supply cut along 4-4 of FIG.
5 is a longitudinal cross-sectional view cut along 5-5 of FIG.
6 is a longitudinal cross-sectional view taken along 6-6 of FIG.

Hereinafter, a cooking apparatus equipped with a steam supply device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a rear perspective view of a cooking appliance according to an embodiment of the present invention.

Referring to FIG. 1, a cooking apparatus 10 according to an embodiment of the present invention includes a cavity 11 in which a cooking chamber is formed, a door 12 opening and closing a front opening of the cavity 11, and The water tank 13 placed on the upper surface of the cavity 11, the steam supply device 20 mounted on the rear surface of the cavity 11, and the water tank 13 and the steam supply device 20 are connected to each other. The flow path may include a pump module 30 connected to the flow path.

In detail, the cavity 11 may be equipped with a heating device for cooking food, a circulation fan for hot air circulation inside the cooking chamber. In addition, a control panel including an operation unit may be mounted on an upper side of the door 12.

The water tank 13 may be provided in a drawer type on an upper side of the door, and may be detachably provided from the cavity 11. In addition, the water tank 13 is accommodated in the tank housing to be retractable, the tank housing may be fixed to the upper side of the cavity (11).

In addition, a water supply port 131 and a drain port 132 may protrude from the rear surface of the tank housing. In addition, the flow path may be provided in the form of a tube that can be bent.

In addition, the pump module 30 includes a water supply pump 31 for supplying water in the water tank 13 to the steam supply device 20, and water remaining in the steam supply device 20. It may include a drain pump 32 to return to the tank 13. The drain pump 32 may be defined as a recovery pump because the drain pump 32 functions to return the water of the steam supply device 20 to the water tank 13.

The flow path may include a water supply flow path 133 connected to the water supply port 131, a drain flow path 134 connected to the drain port 132, a water supply flow path 133, and a drain flow path 134. It may include a common flow path 135 connected to the point where the.

The water feed pump 31 is mounted on the water supply passage 133, and the drain pump 32 is mounted on the drain passage 134. The end portions of the water supply passage and the drain passage extending from the outlet side of the feed pump 31 and the drain pump 32 meet at one point, and the common passage 135 extends at the meeting point. The outlet end of the common flow path 135 is connected to the steam supply device 20.

According to the flow path structure constituting the above configuration, the water filled in the water tank 13 is supplied to the steam along the water supply flow path 133 and the common flow path 135 by the operation of the water supply pump 31. Supplied to the device 20. And, after the steam supply is completed, the water remaining in the steam ball device 20 is the water tank 13 along the common flow path 35 and the drain flow path 134 by the operation of the drain pump (32). Back to

Hereinafter, the configuration and function of the steam supply device 20 according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a left perspective view of a steam supply device according to an embodiment of the present invention, Figure 3 is a right perspective view of the steam supply device.

2 and 3, the steam supply device 20 according to an embodiment of the present invention, the steam supply unit 21 for generating and supplying steam, and the steam generated from the steam supply unit in the cavity 11 It may include a steam supply passage 25 to guide to, and a recovery unit 26 connected to one end of the steam supply passage 25 to collect the condensed water generated in the steam supply process.

In detail, the steam supply unit 21 may include a casting type case 22, a heater 23 for generating steam embedded in the case 22, and a case 22 mounted inside the case 22. 22 may include a thermistor 24 to prevent overheating. In addition, the recovery part 26 may be coupled to the side of the steam supply part 21 by a fastening bracket 29.

In addition, the case 22 includes a heater buried portion 221 having a substantially hexahedral shape, and a thermistor mounting portion 222 protruding from one side of the heater buried portion 221 and having the thermistor 24 mounted therein. And a steam generator 223 extending in a cylinder form at an intermediate portion of the heater buried portion 221, and a water supply port 224 extending from a lower end of the heater buried portion 221.

The heater 23 may be a U-shaped seed heater, and both ends of the heater 23 may protrude on the case 22, specifically, the upper surface of the heater buried portion 221. In addition, the steam generator 223 may be formed between both ends of the heater 23.

In detail, the heater buried portion 221 has a longer length in the vertical direction than the left and right width, it may be made of a thickness larger than the diameter of the heater (23).

The steam generator 223 may be formed in a hollow cylindrical shape so that steam and water are filled, and the rear end of the steam generator 223 is spaced apart from a rear end of the heater buried part 221. Can be located.

As illustrated, the inner diameter of the steam generator 223 is the thickness of the heater buried part 221 so that the front end of the steam generator 223 protrudes further from the front surface of the heater buried part 221. It may be designed larger, but is not necessarily limited thereto. In addition, the steam generator 223 may be designed as a truncated cone type cylinder that has an inner diameter of the same shape or increases from the bottom to the top.

In addition, an upper end of the steam generator 223 may further extend a predetermined length from an upper surface of the heater buried part 221 (or the case 22), and protrudes from an upper surface of the heater buried part 221. An upper portion of the steam generator 223 may be defined as a discharge port 225.

On the other hand, the steam supply passage 25 is fitted to the outer circumferential surface of the discharge port 225, the rising portion 251 which extends upward, and the extending portion bent from the upper end of the rising portion 251 ( 252, a lower portion 253 which is bent at an end of the extension portion 252 and extends downward, and a cavity connection portion 254 extending at any point of the lower portion 253. In addition, the extension part 252 may extend horizontally.

In addition, the cavity connection part 254 may have a diameter smaller than the diameter of the lower part 253 and may be bent in an approximately S shape. In detail, the cavity connection part 254 may be horizontally extended at any point of the lowering part 253 and then bent upwardly, and bent again to extend horizontally. The end of the cavity connection part 254 communicates with the inside of the cavity 11 through the rear surface of the cavity 11. Therefore, steam flowing along the steam supply passage 25 is supplied into the cavity 11 through the cavity connection part 253.

Here, since the volume of the steam generator 223 in the form of a cylinder is small, when water supplied to the steam generator 223 is heated, boiling occurs vigorously, especially when bumping occurs, The high temperature water flows out of the steam generator 223 together with the steam.

At this time, it is necessary to properly design the shape of the steam supply passage 25 in order to prevent the boiled water from flowing into the cavity 11.

To this end, the steam supply passage 25 may be designed to be bent in the form of n-shaped so that the boiled water does not flow into the cavity 11 but falls by gravity.

In addition, the cavity connecting portion 254 is branched at one side of the lower portion 253 and extended upward, so that only gas in the liquid and gas on the steam supply passage 25 is supplied into the cavity 11. Be sure to

In addition, it is necessary to allow the condensed water generated in the steam supply process to be recovered into the steam generator 223 without being introduced into the cavity 11. To this end, the recovery part 26 may be mounted at an end of the lower part 253. A condensate storage space is formed in the recovery part 26, and a recovery flow path 28 extends on the bottom of the recovery part 26.

An end of the recovery flow path 28 is connected to the common flow path 135 connecting the pump module 30 and the water supply port 224. Therefore, the condensed water discharged along the recovery flow path 28 is supplied to the steam generator 223 together with the water supplied along the common flow path 135.

Meanwhile, an n-shaped flow path connecting the steam supply part 21 and the housing 27 may be defined as a first flow path, and the cavity connection part 254 branched from the first flow path may be defined as a second flow path. have.

Hereinafter, the cross-sectional structure and the internal structure of the steam supply unit 21 and the recovery unit 26 will be described in detail with reference to the drawings.

4 is a side cross-sectional view of the steam supply section cut along 4-4 of FIG. 2, FIG. 5 is a longitudinal cross-sectional view cut along 5-5 of FIG. 2, and FIG. 6 is a cut along 6-6 of FIG. 2. Longitudinal section.

Referring to FIG. 4, the central axis C1 of the steam generator 223 and the central axis C2 of the water inlet 224 do not coincide with each other, and have a predetermined distance in the thickness direction of the steam generator 223. You can see that it is spaced apart. This is because it is necessary to embed the heater 23 bent in the U shape at the same time as generating the steam generator 223 in the heater buried portion 221.

In other words, in order to prevent the lower end of the heater 23 having a U shape from interfering with the steam generator 223, the lower end of the steam generator 223 avoids the lower end of the heater 23. To extend. As a result, the water inlet 224 extends forward from the center of the heater buried portion 221. The diameter of the flow path connecting the lower end of the steam generator 223 and the water inlet 224 is formed to have a size corresponding to the inner diameter of the water inlet 224.

Referring to the shape of the steam generating unit 223 in another way, the steam generating unit 223 is formed stepped at the point where the lower end of the heater 23 passes, the step is defined steam on the upper side of the surface It may be said that the diameter of the generation unit 223 is formed to be larger than the diameter of the steam generation unit 223 defined below the step.

Referring to FIG. 5, the water level sensor 28 is mounted inside the housing 27 of the recovery unit 26 to measure the water level inside the housing 27. The internal space of the housing 27 and the internal space of the steam generator 223 communicate with the common flow path 135 and the recovery flow path 28. Therefore, the water level inside the housing 27 can be seen as the water level inside the steam generator 223. Therefore, since the water level sensor does not need to be mounted inside the steam generator 223, the steam supply unit 21 may be easily manufactured.

Meanwhile, the water level sensor 28 may include an electrode type water level sensor. The electrode type water level sensor has an advantage of excellent heat resistance at high temperatures compared to other types of water level sensors such as capacitive sensors.

In addition, the water level sensor 28 of the electrode type may penetrate the upper surface of the housing 27 to be vertically inserted into the housing 27 and extend downward. If the water level sensor 28 is inserted in the horizontal direction from the side of the housing 27, the water supplied to the steam generating unit 223 leaks through a through hole through which the water level sensor 28 passes. Can be. Therefore, the water level sensor 28 is inserted through the upper surface of the housing 27 to prevent the leakage problem.

In addition, the electrode type water level sensor is advantageous in the situation of being exposed to high temperature steam because the ability to withstand high temperature heat is superior to the capacitive sensor.

 In detail, the water level sensor 28 includes a common electrode 281, a low water level electrode 282, and a high water level electrode 282. The lower end of the common electrode 281 is at the same height as the lower end of the low water level electrode 282 or extends to a position closer to the bottom of the housing 27. The lower end of the high water level electrode 283 is located at a point higher than the lower end of the low water level electrode 282. Therefore, when the water level is filled in the housing 27 and the water level reaches the lower end of the low water level electrode 282, the low water level is sensed while the current falls to the common electrode 281. When the water level reaches the lower end of the high water level electrode 282, the water level is detected as a high water level.

Meanwhile, Teflon coating is applied to the lower ends of the water level electrodes 281, 282, and 283 to minimize malfunctions.

In addition, when the common electrode 281 and the low water level electrode 282 and the high water level electrode 283 corresponding to the operation electrode are disposed on one side of the lower portion 253, malfunctions may occur due to flowing water. The possibility of noise is increased. In order to minimize the occurrence of such a problem, the mounting positions of the common electrode 281 and the operation electrode are separated from each other based on the lower portion 253, thereby minimizing the possibility of occurrence and frequency of noise due to electrode malfunction. .

That is, since the common electrode 281 and the operation electrode are disposed to be opposite to each other, the water flowing along the lower portion 253 flows along both the common electrode 281 and the operation electrode to generate noise. It can be minimized.

In detail, the common electrode 281 may be disposed on the left side of the lower portion 253, and the operation electrode may be disposed on the right side of the lower portion 253.

In addition, as the frequency of use, that is, the electrode having a high frequency of contact with the water, the farther away from the lower portion 253 of the steam supply passage 25 is better. Therefore, the common electrode 281 having the most contact frequency with the water surface is located at a point far from the lower portion 253, so that the discharge water generated during the steam generation process and the condensed water generated during the steam supply process fall. It may flow along the inner circumferential surface of the portion 253 and flow through the electrode to prevent malfunction.

For example, since the frequency of use of the low level electrode 282 is higher than the frequency of use of the high level electrode 283, the low level electrode 282 is located outside the high level electrode 283, so that the lower portion 253 is used. Can be located farthest from

In addition, a prevention part may be formed on an upper surface of the housing 27 corresponding to the lower part 253 and the electrode to minimize discharge of the discharged water and the condensed water through the electrodes 281, 282, and 283. The prevention part may be formed in a predetermined depth recessed from an upper surface of the housing 27. In other words, when viewed from the outside of the housing 27, the preventive portion may be defined as a depression, and when viewed from the inside of the housing 27, it may be defined as a protrusion or a jaw.

In detail, the prevention part may include a first prevention part 271 and a second prevention part 272. The first prevention part 271 is formed on an upper surface of the housing 27 corresponding to the lower part 253 and the common electrode 281. The second prevention part 272 is formed on an upper surface of the housing 27 corresponding to the lower part 253 and the high water level electrode 283.

In more detail, the first prevention part 271 may include a first inner inclined surface 271a that is inclined toward the common electrode 281 from a lower end of the lowering part 253, and a lower end of the first inner inclined surface 271a. And a first outer inclined surface 271b inclined upwardly. In addition, since the first inner inclined surface 271a and the first outer inclined surface 271b have a substantially V-shaped cross-sectional shape, the water flowing through the inner circumferential surface of the lower portion 253 is in contact with the first inner inclined surface 271a. At the tip where the first outer inclined surface 271b meets, the surface tension is minimized to fall to the bottom of the housing 27. Therefore, water flowing through the lower portion 253 may be prevented from flowing to the common electrode 281.

Here, the angle formed by the first outer inclined surface 271b from the horizontal plane passing through the point where the first inner inclined surface 271a and the first outer inclined surface 271b meets, the first inner inclined surface 271a from the horizontal plane It is formed to be larger than the forming angle, it is possible to prevent the water flows toward the common electrode 281.

On the other hand, like the said 1st prevention part 271, the said 2nd prevention part 272 also contains the 2nd inner side inclined surface 272a and the 2nd outer side inclined surface 272b. The inclination angle of the second outer inclined surface 272b is greater than the inclination angle of the second inner inclined surface 272a based on a horizontal plane passing through the point where the second inner inclined surface 272a and the second outer inclined surface 272b meet. Make it large.

In addition, the depression length of the second prevention portion 272 may be formed larger than the depth of depression of the first prevention portion 271. This is because the area of the upper surface of the housing 27 on which the operation electrode is mounted is larger than the area of the upper surface of the housing 27 on which the common electrode 281 is mounted, so that the depth of the recess is relatively larger. have.

On the other hand, the U-shaped seeds heater 23 is embedded, the steam under the conditions of maintaining the temperature of the steam supply unit 21 having a casting type case 22 having a cylindrical steam generating unit 233 in the center at 180 ℃ When the water level h in the generator 223 is maintained at 25% of the height H of the steam generator 223, an optimum steam generation efficiency may be achieved.

When the inside of the steam generator 233 is maintained at a low water level, the temperature of the steam generator 233 continuously rises, and the heater 23 is turned off to prevent overheating. As a result, the steam generation time is shortened, resulting in a problem that the steam generation efficiency is lowered.

On the contrary, when the inside of the steam generator 233 is maintained at a high water level, the temperature of the steam generator 233 is lower than an appropriate temperature, so that the time required for steam generation is not only long, but also toward the outlet of the steam generator 233. Dolby phenomenon may occur in which steam and water are discharged together.

In addition, the inner diameter of the steam generator 223 that can produce the optimum steam generation efficiency according to the output of the heater 23 should be set differently.

For example, when the output of the heater 23 is less than 1000W, the inner diameter of the steam generating unit 223 is appropriately 9mm ~ 11mm, when the inner diameter of the steam generating unit 223 is 14mm ~ 16mm when more than 1000W ~ 1500W. In the case of 1500W or more, the inner diameter of the steam generating unit 223 is appropriately 17mm ~ 19mm.

More preferably, when the output of the heater 23 is less than 1000W, the inner diameter of the steam generator 223 is appropriately 10mm, when the inner diameter of the steam generator 223 is 15mm is more than 1000W ~ 1500W In the case of 1500W or more, the inner diameter of the steam generator 223 is appropriately 18 mm.

On the other hand, the formation position of the cavity connecting portion 254 in the steam supply passage 25 will be described in more detail.

The cavity connection part 254 should be formed at a lower point than the center of the extension part 252 to prevent the discharge water splashing during the steam generation process from being introduced into the extension part 252. If the cavity connection part 254 extends in the horizontal direction at the same height as the extension part 252, the discharge water may flow into the cooking chamber, which is not preferable.

In addition, the cavity connection part 254 may be formed at a point spaced downward from an upper end of the lower part 253, but if formed at a point too close to a lower end, there is a difficulty in mounting the water level sensor 28. . Therefore, the cavity connection part 254 may be formed at a point spaced apart from the upper surface of the housing 27 by at least 50 mm or more.

In addition, rather than extending horizontally from the lower portion 253, the cavity connecting portion 254 preferably extends horizontally and then bends upward. This may be said to fundamentally block condensed water flowing along the inner circumferential surface of the lower portion 253 from flowing into the cooking chamber along the cavity connecting portion 254.

 Referring to FIG. 6, the length a1 from the upper end of the steam generator 223 to the stepped surface is about eight times the length a2 from the surface of the stepped surface to the lower end of the case 22. It is good to be designed. If more than 8 times, the distance between the rounded lower end of the U-shaped heater and the steam generator 223 is too close, so that the entire surface of the steam generator 223 cannot be heated at a uniform speed, and the step Heating unevenness may occur, in which the losing surface is heated rapidly. On the contrary, if it is less than 8 times, the step difference may cause a heating nonuniformity in which the heating rate becomes slow compared to other portions.

Alternatively, the stepped surface may be defined as a lower end of the steam generator, and the stepped passage may be defined as a separate connection flow path to the top of the surface and the water inlet 224.

In addition, the thermistor buried portion 222 may be thermistor receiving groove 222a for receiving the thermistor.

Claims (12)

A case of a casting material having a cylindrical steam generating unit extending in an up and down direction, and a heater embedded in the case and extending in the longitudinal direction of the steam generating unit at points spaced apart from both sides from the steam generating unit; Steam supply unit comprising;
A steam supply flow path including a first flow path extending from the steam generator and a second flow path branched from the first flow path and connected to a cooking chamber; And
A recovery part connected to an end of the first flow path and recovering condensed water in the steam supply flow path,
The recovery unit,
A housing for storing condensate therein,
A water level sensor mounted on an upper surface of the housing and extending into the housing;
The upper surface of the housing, the steam supply device, characterized in that the depression preventing the condensate flowing into the housing along the first flow path to the water level sensor is formed. The method of claim 1,
The water level sensor,
A common electrode extending downward from an upper surface of the housing;
An operation electrode extending downward from an upper surface of the housing,
And the common electrode and the operation electrode are separately disposed on the left side and the right side of the first flow path. The method of claim 2,
The operation electrode,
A high level electrode mounted at a point spaced apart from the first flow path,
A low level electrode mounted at a point spaced apart from the high level electrode,
And the low water level electrode is mounted at a point spaced apart from the first flow path in a direction away from the first flow path. The method of claim 3, wherein
The prevention part,
A first prevention part recessed to a predetermined depth on an upper surface of the housing corresponding to the first flow path and the common electrode;
And a second prevention part recessed to a predetermined depth from an upper surface of the housing corresponding to the first flow path and the high water level electrode. The method of claim 4, wherein
And the second prevention part is recessed deeper than the first prevention part. The method of claim 4, wherein
The lower end of the first prevention part,
A first inner inclined surface inclined toward the common electrode;
And a first outer inclined surface inclined upward from a lower end of the first inner inclined surface. The method of claim 6,
The angle formed between the horizontal surface passing through the lower end of the first prevention portion and the first inner inclined surface is smaller than the angle formed by the horizontal surface and the first outer inclined surface. The method of claim 4, wherein
The lower end of the second prevention part,
A second inner inclined surface inclined toward the high water level electrode,
And a second outer inclined surface inclined upward from a lower end of the second inner inclined surface. The method of claim 8,
The angle formed by the horizontal plane passing through the lower end of the second prevention portion and the second inner inclined surface is smaller than the angle formed by the horizontal plane and the second outer inclined surface. The method of claim 2,
And the ends of the electrodes are Teflon coated. The method of claim 1,
By the water level sensor, the temperature of the steam generator is maintained at 180 ℃ while the water level in the steam generator is maintained at 25% of the height of the steam generator. A cavity in which a cooking chamber is formed;
A door configured to open and close the front opening of the cavity; And
A cooking apparatus comprising the steam supply device according to any one of claims 1 to 11 mounted on an outer surface of the cavity to supply steam to the cooking chamber.

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