JP5796352B2 - Electric water heater - Google Patents

Description

The present invention provides conductive by the heating means of the air heater or the like relates to an electric water heater for heating the liquid (water For example) in the liquid container, more particularly electric kettle steam-less structure which is adapted not emit vapors when kettle outside it relates to the vessel.

Electrical water heaters are generally liquid fluid of the inner container and the inner container to put the (water For example) (e.g., water) for covering the container body with a heating means for heating the, the upper opening of the container body A vapor discharge port for discharging vapor to the outside when boiling is provided on the upper surface of the lid.

  The steam exhaust port introduces steam from the steam inlet port portion on the inner surface side of the lid, passes through the steam discharge passage through the overturn stop valve, and extends upward from the slit-shaped steam discharge port formed on the upper surface side to the indoor space. It is made to discharge (for example, refer patent document 1).

  As a result, the pressure in the inner container at the time of boiling decreases, and the liquid (for example, hot water) in the inner container boils in a smooth shape, and after the boiling for a predetermined time is continued, the temperature is kept as needed. It will be transferred to the state.

  However, in the case of the electric water heater having the above-described configuration, there are cases where the electric water heater is used while being placed on the floor surface. In such a case, a child or the like may touch the steam discharged from the steam discharge port. Moreover, if a large amount of steam is emitted, the humidity in the room becomes high, the bran and the wallpaper become wet, and if the boiling state continues more than necessary, there is a problem that power consumption increases.

  Therefore, it is preferable to prevent the steam itself from being emitted to the outside or to reduce the amount of generated steam itself by some method.

In this regard, an electric rice cooker or the like has already been proposed in which steam is not discharged from a steam outlet formed in the lid (see Patent Document 2).

  However, it is impossible to apply the technology in an electric rice cooker or the like to an electric water heater. For example, in the case of a type in which the steam path is cooled by passing it through a water tank, when the steam path is submerged, the steam outlet is blocked, and a dangerous state of natural discharge from the discharge port unique to the electric water heater occurs.

In addition, there is a possibility that the inside of the inner container becomes negative pressure after boiling, and the water in the water tank may be sucked up.If the hot water is discharged, there is a possibility that a malfunction peculiar to an electric water heater such as sucking up the water in the water tank may occur. is there.

  Furthermore, in the case of using a fan to cool the steam to a temperature where it cannot be seen, it is very costly and the lid of the electric water heater is often detachable. There are problems such as inability.

JP 2009-189519 A Japanese Patent Application Laid-Open No. 8-140836

As described above, in the case of an electric water heater, there is a problem that it is preferable not to emit steam itself or to reduce the amount of steam generated itself.

The present invention has been Do to solve the problem as this, by eliminating the steam discharge port for discharging the steam and opens to the outside from the steam outlet such lid of the lid upper surface, An object of the present invention is to provide an electric water heater having a steam-less structure in which steam is not emitted to the outside .

(1) First Problem Solving Means In the present invention, as a first means for solving the above-mentioned problems , an inner container that contains a liquid, a heating means that heats the inner container , the inner container and the heating means. A container main body, a lid that covers the upper opening of the container main body, and an upper opening of the container main body that corresponds to the rear end of the lid when the lid is covered a vapor sensor, the a steam system path provided in the lid body, the steam generated in the inner container is an electric water heater comprising as condensation in the process of flowing in the steam path, the steam the system path, a steam inlet which opens into the inner container, and the vapor outlet opening in the lid outside without opening directly to the outside space after the lid corresponding steam introduced from the steam inlet to the steam sensor After passing through the end And a steam cooling passage for guiding the steam passing through the steam detection passage in the direction of the steam outlet while changing the direction to the left and right, and the steam cooling passage and the steam detection passage, It is characterized in that is directed Ke down slope on the steam inlet side.

With the configuration like this, when the start of the boiling of water in the inner container is steam exiting, the steam is introduced into the vapor detection passage from the steam inlet, the flow to the rear end portion of the lid corresponding to the vapor sensor Then, it is detected by the steam sensor at the rear end portion that the water has boiled quickly, and for example, the heating means is controlled from the hot water state to the heat retaining state. As a result, the subsequent steam generation amount is quickly reduced.

Then, the steam that has passed through the rear end portion of the lid body is supplied to the steam cooling passage that leads to the steam outlet direction while changing the direction to the left and right through the downstream portion of the steam detection passage that is U-turned and extends forward. By flowing over time in the direction of the steam outlet while changing the direction to the left and right, most things are surely condensed. Then, as described above, the condensed water that has condensed is returned to the steam inlet through the steam cooling passage and the steam detection passage inclined downward toward the steam inlet side, and is returned to the inner container from the steam inlet. The

As a result, almost no steam is discharged from the steam outlet portion on the steam system end side, and the steam outlet itself does not open directly to the external space, for example, corresponding to a predetermined portion inside the container body. Since it is opened outside the lid in a state, steam is not directly discharged from the lid to the outside.

Therefore, it is not necessary to form a steam discharge port on the upper surface of the lid as in the prior art, and the steam itself does not come out from the water heater body. Humidity does not increase.
(2) Second Problem Solving Means In the present invention, as a second means for solving the above-described problems , an inner container that contains a liquid, a heating means that heats the inner container , the inner container and the heating means. a container body accommodating a, is supported so as to be opened and closed on the rear end side of the upper side opening of the container body, a lid for covering the upper side opening of the container body, the upper side opening of the container body Steam generated in the inner container, and provided with a steam sensor corresponding to a rear end portion of the lid on the shaft support portion side when the lid is covered, and a steam path provided in the lid. An electric water heater in which dew condensation occurs in the process of flowing in the steam path , wherein the steam system path is opened to the outside of the lid without opening directly to the external space and the steam inlet opening in the inner container a vapor outlet that is, from the steam inlet A steam detection passage that guides the introduced steam to the front after passing through the rear end of the lid corresponding to the steam sensor, and the steam outlet while changing the direction of the steam that has passed through the steam detection passage left and right A steam cooling passage that leads in a direction, and each of the steam cooling passage and the steam detection passage is inclined downward toward the steam inlet side, and the rear end of the steam detection passage corresponding to the steam sensor An opening is provided in the portion for allowing the steam sensor to face when the lid is covered, and for returning the condensed water in the steam cooling passage and the steam detection passage to the inner container when the lid is opened. It is characterized by that.

According to such a configuration, when boiling of water in the inner container starts and steam is emitted, the steam is introduced into the steam detection passage from the steam inlet, and the rear end portion on the shaft support side of the lid corresponding to the steam sensor It is detected that the steam sensor has boiled quickly at the rear end portion, and for example, the heating means is controlled from a hot water state to a heat retaining state. As a result, the subsequent steam generation amount is quickly reduced.

Then, the steam that has passed through the rear end portion of the lid body is supplied to the steam cooling passage that leads to the steam outlet direction while changing the direction to the left and right through the downstream portion of the steam detection passage that is U-turned and extends forward. By flowing over time in the direction of the steam outlet while changing the direction to the left and right, most things are surely condensed. Then, as described above, the condensed water that has condensed is returned to the steam inlet through the steam cooling passage and the steam detection passage inclined downward toward the steam inlet side, and is returned to the inner container from the steam inlet. The

As a result, almost no steam is discharged from the steam outlet portion on the steam system end side, and the steam outlet itself does not open directly to the external space, for example, corresponding to a predetermined portion inside the container body. Since it is opened outside the lid in a state, steam is not directly discharged from the lid to the outside.

Therefore, it is not necessary to form a steam discharge port on the upper surface of the lid as in the prior art, and the steam itself does not come out from the water heater body. Humidity does not increase.

In addition, in the case of the above-described configuration, the steam sensor on the container body side is allowed to face the rear end portion on the shaft support side corresponding to the steam sensor in the steam detection passage while the lid is covered, while the lid When the body is opened, an opening for returning the condensed water in the steam cooling passage and the steam detection passage into the inner container is provided. When the lid is closed using the opening, the container body side The steam sensor can be positioned in the steam detection passage, and when the lid is open, the condensed water remaining in the steam cooling passage and the steam detection passage is reliably discharged into the inner container. It can be done.

As a result, it is possible to detect boiling with higher reliability and higher responsiveness, and it is possible to more reliably collect condensed water, which is hygienic.

As a result of the above, according to the present invention, there is no conventional steam outlet such as the steam outlet on the upper surface of the lid body, and no steam is directly discharged to the outside from the lid body. As a result, the risk that children and the like will come into contact with the vapor from the lid is eliminated, and safety is increased.

  In addition, since most of the steam generated in the inner container condenses almost reliably in the steam path and is collected in the inner pot, not only the lid but also the steam itself released from the container body to the outside is very small, There is no need to increase indoor humidity.

It is a perspective view of the electric water heater concerning embodiment of this invention. It is a longitudinal cross-sectional view of the electric water heater concerning embodiment of this invention. It is a perspective view at the time of the cover body opening of the electric water heater concerning embodiment of this invention. It is the X section enlarged view of FIG. It is a perspective view of the cover in the electric water heater concerning embodiment of this invention. It is a perspective view which shows the state which removed the upper plate of the cover body in the electric water heater concerning embodiment of this invention. It is a perspective view which shows the vapor | steam path | route structure part attached to the cover body in the electric water heater concerning embodiment of this invention. It is a disassembled perspective view of the steam path | route structure part shown in FIG. It is explanatory drawing which shows the flow of the vapor | steam in the vapor | steam path | route in the electric water heater concerning embodiment of this invention. It is explanatory drawing which shows the flow of the vapor | steam and condensed water from an inner container to a vapor | steam sensor part in the vapor | steam path | route in the X section enlarged view shown in FIG. It is explanatory drawing which shows the flow of the vapor | steam and condensed water from a vapor | steam sensor part to a vapor | steam path structure part in the vapor | steam path | route in the X section enlarged view shown in FIG. It is explanatory drawing which shows the flow of the dew condensation water in the cover body at the time of the cover body opening in the electric water heater concerning embodiment of this invention. It is explanatory drawing which shows the flow of the dew condensation water in the vapor | steam path | route at the time of the front inclination of the electric water heater concerning embodiment of this invention, or the time of forward fall. It is explanatory drawing which shows the flow of the dew condensation water in the vapor | steam path | route at the time of the lid body opening of the electric water heater concerning embodiment of this invention at the time of back tilting, or backward fall.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  This electric water heater has a water heater and a heat retaining function, and includes a container body 1 having an inner container 3 for storing a liquid (for example, water), a lid body 2 for opening and closing the upper side opening of the container body 1, An AC heater is connected to an electric heater 4 that is a heating means for heating the inner container 3 at the time of boiling and keeping warm, a hot water supply passage 5 for pouring hot water in the inner container 3 to the outside, and an AC power source. And an electric hot water supply pump 6 for pouring hot water in the inner container 3 to the outside through the hot water supply passage 5. Reference numeral 5 a denotes an outlet (that is, a discharge port) of the hot water supply passage 5, and 5 b denotes a transparent measuring tube provided in a straight pipe portion located at the front portion of the container body 1 in the hot water supply passage 5.

  The container body 1 includes a cylindrical outer case 7 made of a synthetic resin that forms an outer surface portion (in the case of the present embodiment, a rectangular tube shape), the inner container 3 that forms an inner surface portion, and the outer case 7. And the inner container 3 are integrally coupled and fixed on the upper side, and the synthetic resin annular shoulder member 8 which is mounted when the lid 2 is closed, and the synthetic resin dish-shaped plate constituting the bottom surface portion. And the bottom member 9. Reference numeral 10 denotes a transparent measuring window provided at a position where the measuring tube 5b can be seen at the front portion of the outer case 7.

  The inner container 3 has a bottomed cylindrical inner cylinder 3A made of stainless steel and a cylindrical outer cylinder 3B which is also made of stainless steel and has no bottom part, joined to each other at the upper end side part and the lower end side part. It is made of a heat insulating structure with a vacuum double wall structure having a high heat insulation performance in which a vacuum heat insulating space is provided between the cylinder 3A and the outer cylinder 3B, and at the bottom, the inner cylinder 3A and the outer cylinder 3B on the outer peripheral side A single plate portion 3a constituted only by the bottom surface portion of the inner cylinder 3A is formed except for the joint portion. The single plate portion 3a is formed so as to protrude slightly higher upward, and the electric heater 4 (for example, a mica heater in which two sets of heating elements having different wattages are held on a mica plate) is formed on the lower surface side thereof. Is attached.

  The lid 2 includes a synthetic resin upper plate 11 and a synthetic resin lower plate 12 whose outer peripheral edges are coupled to each other with respect to the upper plate 11. The end portion 8a is supported by a hinge pin 13 and a hinge lock 14 so that the end portion 8a can be opened and closed in a vertical direction and is detachable.

Further, in the lid body 2, steam that opens into the inner container 3 and opens at a position (for example, the lower surface side) other than the steam inlet 16 communicating with the inner container 3 and the upper surface of the lid body 2. A steam path 15 connecting the outlet 17 is formed. The steam path 15 is formed in a steam recovery unit 18 disposed in the lid 2. In order to enhance the cooling effect of the steam S flowing in the steam path 15, a heat radiation space 32 is provided between the steam recovery unit 18 and the upper plate 11 of the lid 2. Between the recovery unit 18 and the lower plate 12 of the lid body 2, a heat insulating material 28 that prevents heat transfer from the inner container 3 is provided. In addition, if an aluminum foil or the like having a heat radiation effect is attached to the upper surface of the steam recovery unit 18 (that is, the upper surface of an upper constituent member 18b described later), the cooling effect on the steam S is further increased.

As shown in FIGS . 8 and 9 , the steam recovery unit 18 is configured by integrally combining a synthetic resin lower component member 18a and a synthetic resin upper component member 18b. (That is, the rectangular portion 19 located on the rear end side of the lid body 2), a semicircular enlarged portion 20 located on the front side of the rectangular portion 19, and one end side of the enlarged portion 20 (that is, an upper view). And a projecting portion 21 projecting forward from the left side. The steam inlet 16 is provided at a rear portion of the enlarged portion 20, and the steam outlet 17 is provided at a tip portion of the protruding portion 21.

Incidentally, the vapor outlet 17 is entirely instead of communicating with the inner container 3, a portion communicates with the inner container 3, or One part of the hot water passage 5 within the shoulder member 8 outlet (i.e. , Discharge port) 5a. If it does in this way, the steam introduction to the steam path 15 will concentrate on the steam inlet 16, and the steam path 15 can be used effectively as a dew passage (cooling path) for the steam S.

  As shown in FIG. 9, the steam path 15 includes a first passage 15 a that guides the steam S introduced from the steam inlet 16 to the rear side (that is, the rear end portion of the rectangular portion 19), and the first passage. A second passage 15b that makes a U-turn from the rear end of 15a and extends to the front side (that is, the rear side of the enlarged portion 20), and a third passage that extends to the left and right at an intermediate position of the enlarged portion 20 following the second passage 15b. A passage 15c, a fourth passage 15d extending left and right at the intermediate position of the enlarged portion 20 following the third passage 15c, and a fifth extending left and right at the front end of the enlarged portion 20 following the fourth passage 15d. The passage 15e includes a fifth passage 15e and a sixth passage 15f that extends to the front end of the protruding portion 21 and reaches the steam outlet 17.

That is, the steam path 15 has a U shape from the front to the rear and from the rear to the front, and a zigzag shape from left to right so that the steam S flowing through the steam path 15 is easily condensed. It is a long detour route. In this way, the steam cooling effect is improved, and even if the electric water heater falls to the left or right side, the hot water in the inner container 3 may leak from where one of the zigzag shapes is on the upper side. Disappear.

A communication portion between the first passage 15a and the second passage 15b (that is, a U-turn portion forming a U-shaped passage as a whole ) has a shoulder to detect the temperature of the steam S flowing through the communication portion. an opening (vapor sensor 22 insertion and condensation water discharging open port) 23 for facing the vapor sensor 22 attached to the member 8 is formed, the opening edge of the opening 23, the lid 2 A seal packing 24 is provided for sealing the opening 23 when the cover is closed (when the cover is closed ) . Thus, the first passage 15a and the second passage 15b for the steam detector is communicated to each other in a sealed state only during closing of the lid 2 as shown in FIG. 4, the vapor detection passage in the communicating state In addition, the steam sensor 22 on the shoulder member 8 side is inserted into the opening 23 to detect the arrival (boiling) of steam . On the other hand, at the time of lid opening of the lid 2 as shown in FIG. 12, the opening 23 is opened downward, from the opening 23, condensed water W in the first to sixth passages 15a~15f is It is surely discharged (that is, refluxed into the inner container 3). These first to sixth passages 15a~15f is partitioned and formed by the ribs 25 extending integrally on the upper surface of each of the lower component 18a.

  The third passage 15c includes a passage enlargement portion 15c1 that is located on the outlet side of the second passage 15b and has a passage cross-sectional area that is widened, and a right side of the passage enlargement portion 15c1 that is positioned when the electric water heater is inclined forward or A trap portion 15c2 that traps the dew condensation water W when the vehicle falls forward (see FIG. 13) is formed, and the fourth passage 15d is located on the outlet side of the third passage 15c and has an enlarged passage cross-sectional area. 15d1 and a trap portion 15d2 which is located on the left end side of the passage expanding portion 15d1 and traps the condensed water W when the electric water heater is tilted forward or falls forward (see FIG. 13), is formed in the fifth passage 15e. Is located on the outlet side of the fourth passage 15d and has a passage enlarged portion 15e1 with an enlarged passage cross-sectional area, and is located on the right end side of the passage enlarged portion 15e1 when the electric water heater is inclined forward or A trap portion 15e2 is formed for trapping the dew condensation water W when the vehicle falls over (see FIG. 13), and the sixth passage 15f is located on the outlet side of the fifth passage 15e when the electric water heater is inclined forward or forward. Condensed water W is trapped at the time of falling (see FIG. 13). Trap part 15f2 is located on the outlet side of the sixth passage 15f and traps condensed water W when the electric water heater is tilted forward or falls forward (see FIG. 13). ) A trap portion 15f3 is formed. In the present embodiment, the passage expanding portions 15c1, 15d1, and 15e1 are configured such that the passage is enlarged on the same plane as the third to fifth passages 15c to 15e, but the passage sectional area is increased. In other words, the passage cross-sectional area can be increased in the vertical direction (that is, the depth direction).

  The steam recovery unit 18 is attached so that the entire steam path 15 is inclined downward toward the steam inlet 16 side (that is, the hinge side) when the lid 2 is closed. In this way, the dew condensation water W generated by the dew condensation of the steam S flowing through the steam path 15 is easily recirculated from the steam inlet 16 into the inner container 3.

  Further, a metal inner cover member 26 having a steam inlet 26 a to the steam inlet 16 is fixed to the lower surface side of the lower plate 12 in the lid 2, and the outer peripheral edge of the inner cover member 26 is fixed. A seal packing 27 made of heat-resistant rubber that is pressed against the upper end opening of the inner container 3 when the lid 2 is closed is provided on the entire circumference.

  In the drawings, reference numeral 29 is a lid opening / closing lever for regulating the opening / closing state of the lid body 2, 30 is an operation panel portion having an operation surface of various switches and a display surface of liquid crystal display means, and 31 is used when carrying an electric water heater. It is a handle.

With the above configuration, after starting boiling, the steam S from the inner container 3 led to the steam inlet 16 through the steam inlet 26a at the lower part of the lid 2 is, as shown in FIG. In the process of flowing toward the steam outlet 17, first , the steam temperature is responsively quickly by the steam sensor 22 in the first passage 15 a to the second passage 15 b (the U-turn portion) which is the steam detection passage on the steam inlet 16 side. Ru is detected. And as a result , if it determines with it being in a boiling state, the said electric heater 4 will boil water and will be from a heating state to a heat insulation heating state.

Therefore, according to this configuration, the start of the boiling of the water in the inner container 3 is much faster than the conventional boiling sensor that detects the temperature of the bottom of the inner container 3, and by the actual steam. becomes so that it is possible to reliably detect, stop immediately kettle heat correspondingly, since it is possible to switch warmth heating, with the amount of steam S generated from the hot water in the inner container 3 is reduced It also saves energy.

Thereafter, the steam S is to enter the third passage 15c from the second passage 15b, the pressure in the passage enlarged portion 15c1 which definitive in the third passage 15c is reduced, condensation is promoted. Thereafter, also in the process of flowing through the fourth passage 15d and the fifth passage 15e, the pressure is reduced in the respective passage enlarged portions 15d1 and 15e1, and condensation is promoted.

Therefore, according to the above configuration , most of the steam S is changed to the dew condensation water W in the process of flowing through the steam path 15 that is the steam cooling passage, and almost no steam is discharged from the steam outlet 17. And the dew condensation water W condensed in the steam path 15 is steam in which the entire first to sixth passages 15a to 15f are inclined downward toward the steam inlet 16 side when the lid body 2 is closed. It flows toward the steam inlet 16 via the path 15 and is refluxed into the inner container 3 from the steam inlet 16.

In addition, in the above configuration, the steam outlet 17 itself is opened outside the lid 2 in a state where it does not directly open to the external space, such as the opening corresponding to the shoulder member 8 portion of the container body as described above. As a result, the vapor is not directly discharged from the lid 2 to the outside.

Therefore, it is not necessary to form a steam discharge port on the upper surface of the lid body 2 as in the prior art, and the steam itself does not come out from the water heater body. There is no longer any increase in humidity.

  Further, when the electric water heater is tilted forward or falls forward, as shown in FIG. 13, the portion excluding the portion of the condensed water W generated in the steam path 15 that is recirculated from the steam inlet 16 into the inner container 3. Flows in the steam path 15 toward the steam outlet 17, but is stored in the trap portions 15c2, 15d2, 15e2, 15f2, and 15f3. In addition, although the dew condensation water W in the part from the inlet side of the trap part 15f3 to the steam outlet 17 may be discharged | emitted from the steam outlet 17, since there is almost no dew condensation water W remaining in the said part, it does not become a problem. .

  Further, when the lid 2 is opened, as shown in FIGS. 12 and 14, a portion excluding the portion of the dew condensation water W generated in the steam path 15 that is recirculated from the steam inlet 16 into the inner container 3. The dew condensation water W flows out from the communication hole 23 where the steam sensor 22 faces (that is, returns to the inner container 3).

  Furthermore, when the electric water heater is tilted backward or falls backward, as shown in FIG. 14, the portion of the condensed water W generated in the steam path 15 that is recirculated from the steam inlet 16 into the inner container 3 is excluded. The portion returns to the communication portion (that is, the U-turn portion) between the first passage 15a and the second passage 15b that the steam sensor 22 faces. Thereafter, when the electric water heater is returned to the normal posture (ie, the upright posture), the condensed water W is returned to the inner container 3 from the steam inlet 16 to the steam path 15, so that the condensed water W is outside. It will no longer leak out.

  As described above, in the present embodiment, since most of the generated steam is condensed and recirculated into the inner container 3, a steam-less type electric water heater is provided at an extremely low cost. Is possible. Moreover, since almost no condensed water W remains in the steam path 15, the user does not have to disassemble the steam recovery unit 18 constituting the steam path 15 and perform maintenance (that is, maintenance-free). Become).

In the present embodiment, provided with a steam inlet 16 to the hinge pin 13 side, or One is a steam outlet 17 is provided on the front side of the lid 2, and a steam outlet provided steam inlet 16 to the front side of the cover 2 17 may be provided on the hinge pin 13 side. In addition, if the steam recovery unit 18 is installed with a gap between the steam collecting unit 18 and the hot water pool portion at the time of falling water, the cooling performance can be easily maintained.

  The invention of the present application is not limited to that described in the above embodiment, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.

1 is a container body 2 is a lid 3 is an inner container 4 is a heating means (electric heater)
13 is a hinge pin 15 is a steam path 16 is a steam inlet 17 is a steam outlet 23 is an opening S is steam W is condensed water

Claims (2)

And the inner container containing a liquid, and heating means for heating the inner container, a container body that houses the inner container and the heating means, a lid for covering the upper side opening of the container body, the container body A vapor sensor provided in the upper-side opening and corresponding to the rear end of the lid when the lid is covered, and a vapor system path provided in the lid, are generated in the inner container An electric water heater configured to condense in a process in which steam flows in the steam path , wherein the steam system path is opened to the outside of the lid without opening directly to the external space and the steam inlet opening in the inner container. An open steam outlet, a steam detection passage that guides the steam introduced from the steam inlet through the rear end of the lid corresponding to the steam sensor, and forward the steam through the steam detection passage While changing the steam Together consist steam cooling passage for guiding the outlet direction, electric kettle, characterized in that the same steam cooling passage and said steam detection passage, respectively is directed Ke down slope on the steam inlet side. And the inner container containing a liquid, and heating means for heating the inner container, a container body that houses the inner container and the heating means is openably pivotally supported on the rear end side of the upper side opening of the container body A lid that covers the upper side opening of the container body ; and a vapor sensor that is provided in the upper side opening of the container body and corresponds to the rear end of the lid on the shaft support side when the lid is covered And an electric water heater provided in the lid, wherein the steam generated in the inner container is condensed in a process of flowing in the steam path, the steam path being a steam inlet which opens into the inner container, directly with the vapor outlet opening in the lid outside without opening to the outside space, shaft support side of the lid that steam introduced from the steam inlet corresponding to the vapor sensor Forward through the rear edge A steam detection passage, and a steam cooling passage that guides the steam that has passed through the steam detection passage in the direction of the steam outlet while changing the direction from side to side, and the steam cooling passage and the steam detection passage are respectively connected to the steam inlet side. And when the lid is covered, the steam sensor faces the rear end of the steam detection passage corresponding to the steam sensor when the lid is opened, while the lid is opened. Has an opening for returning the dew condensation water in the steam cooling passage and the steam detection passage into the inner container .

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