JP6160682B2 - Electric water heater - Google Patents

Description

  The present invention relates to an electric water heater, and more particularly to a structure of an electric water heater in which steam is not discharged to the outside.

  An electric water heater such as an electric kettle or an electric kettle generally has an inner container for containing a liquid (water) and a container body provided with heating means for heating the liquid (water) in the inner container, and an opening at the upper part of the container body. A lid for covering is provided, and a steam discharge port for discharging steam to the outside (indoor space) at the time of heating and boiling or the like is provided on the upper surface of the lid.

  The steam discharge port introduces the steam in the inner container from the steam inlet part on the inner surface side (the inner container opening side) of the cover body, and the distance in the cover body thickness direction through the overturn stop valve is short. Through the steam discharge passage, the steam is discharged from the slit-shaped steam discharge port formed on the upper surface side of the lid toward the upper part of the indoor space (for example, Patent Document 1 and Patent Document 2). reference).

  As a result, the pressure in the inner container at the time of heating and boiling is also reduced, and the liquid (water) in the inner container boils safely and smoothly.

  However, in the case of such an electric water heater, 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. In addition, when a large amount of steam is emitted, the indoor humidity becomes high, and there is a problem that the bran and the wallpaper get wet.

  Moreover, if it boils more than necessary, energy-saving performance will also fall.

  Therefore, it is preferable to prevent the steam itself from going out by some method or to reduce the steam generation amount as much as possible.

  From such a viewpoint, in order to solve the above-described problems, the inventors of the present invention provide a steam cooling passage for condensing steam in a detour state inside the lid body, and while flowing through the steam cooling passage. An electric pot or electric kettle of a steam reduction method in which the vapor is made into droplets so as not to emit the vapor to the outside has been proposed (for example, see Patent Document 3 and Patent Document 4).

JP 2009-189519 A JP 2009-172109 A Japanese Patent Application No. 2011-118825 Japanese Patent Application No. 2011-115900

  By the way, when the steam cooling passage is provided in the lid as described above and the steam is condensed in the passage, it is desired that the steam cooling passage portion has good cooling performance. For this reason, it can be considered that the heat insulating property of the steam cooling passage installation portion of the lid is lowered to improve the heat dissipation to the outside.

However, in an electric pot, it is important that the heat retaining function is high, and in that case, it is desired that the heat retaining property of the lid portion is high.

  Therefore, from such a viewpoint, it is not possible to easily reduce the heat retaining property of the lid portion considering only the steam cooling function.

  The present invention has been made to solve such a problem, and improves the steam condensing action of the steam cooling passage that bypasses the inside of the lid as much as possible, and the steam cooling passage from the lid portion. It is an object of the present invention to provide an electric water heater that realizes a vapor disappearance function and a sufficient heat retaining function for the inner hot water by preventing the direct opening to the outside.

The problem-solving means of the present invention includes a container main body provided with an inner container for storing a liquid and a heating means for heating the inner container, and an upper side opening of the container main body that covers the shoulder of the container main body. A lid that is connected to the interior of the inner container from the lid, and a hot water supply passage of the container body is removed from the lid at the front end of the lid. a steam outlet opening into the lid outside in pairs toward moiety, boiling detection section of the lid rear end from the rear the steam inlet side lid between said steam inlet and said steam outlet be in the lid body A steam cooling passage that rises in the direction toward the front end of the lid on the steam outlet side and passes through a steam cooling passage that condenses steam while detouring in both the left and right directions of the lid, and the steam cooling passage that slopes up the steam outlet Rutotomoni provided in the highest position in the vertical direction, the lower Towards the shoulder portion of the side container body is characterized in that is opened.

As described above, in the electric pot, the container main body including the inner container that stores the liquid and the heating unit that heats the inner container, and the upper side opening of the container main body that covers the shoulder of the container main body are covered. excluding a lid, in the rear part of the lid, a steam inlet communicating with the interior of the inner container from the lid body, in the front end portion of the lid, the hot water supply passage of the container body of the lid outside the lid body to and having a structure that includes a vapor outlet opening in the lid outside in pairs toward portions between them steam inlet and steam outlet, the boiling detection section of the lid rear end from the rear steam inlet side lid After passing, if a steam cooling passage is provided that inclines in the direction toward the front end of the lid on the steam outlet side and condenses steam while bypassing in the direction of the left and right sides of the lid , after the boiling, the lid from the steam inlet at the rear of the lid vapor which has entered in the body, first to pass the boiling detection section of the lid rear end Boiling is detected by, the corresponding heating of the inner container it is stopped, the generation of steam is stopped.

Next, the steam that has passed through the boiling detection section is inclined upward from the boiling detection section at the rear end of the lid toward the steam outlet side at the front end of the lid, and bypasses the left and right ends of the lid. by the flow smoothly while bypassing slowly left and right end side by convection, efficiently condensed by condensation, the condensed dew water flows down while bypassing the steam cooling passage in the opposite direction, through the steam inlet Return to the inner container. Therefore, most of the vapor disappears at the vapor outlet opening from the lid to the outside of the lid.

In addition, the steam outlet is located at the front end of the lid, and the passage length is inclined upward from the boiling detector at the rear end of the lid toward the steam outlet at the front end of the lid, and extends while detouring in the left and right ends. Is provided at the highest position in the vertical direction of the end of the long steam cooling passage. Therefore, not only effective convection action of the steam occurs, but also the condensation action of the steam due to the convection action is more effectively realized in the whole of the steam cooling passage inclined upward and detoured in the left and right end directions. Therefore, the dew condensation efficiency is increased.

Furthermore, in this configuration, so that the steam outlet of the steam cooling passage terminating to eliminate the steam, in pairs towards the portion except for the hot water supply passage of the container body of the lid outside the lid body be in the front end of the lid opening It is not opened directly from the lid to the external space . Therefore, sufficient heat retention performance is achieved and steam is not directly discharged from the lid to the outside.

Moreover, the steam outlet opens toward the shoulder of the lower container body to which the lid is attached at the same high position. Therefore, the convection action is reliably interrupted at the same steam outlet portion, and the steam is not discharged due to the convection action.

As a result, both the heat retaining function and the more reliable steamless function are realized at the same time.

  As a result, according to the present invention, an electric water heater having a substantially complete steam-less structure can be provided.

It is a perspective view which shows the external structure in the lid closed state of the electric water heater (electric pot) concerning Embodiment 1 of this invention. It is a perspective view which shows the internal / external structure in the lid open state of the electric water heater (electric pot) concerning Embodiment 1 of this invention. It is sectional drawing of the up-down direction in the lid closed state of the electric water heater (electric pot) concerning Embodiment 1 of this invention. It is an expanded sectional view (FIG. 1A-A cutting part, A'-A 'cutting part of FIG. 6) of the cover body part of the electric water heater (electric pot) concerning Embodiment 1 of this invention. It is a perspective view of the cover body part in the electric water heater (electric pot) concerning embodiment of this invention. It is a perspective view which shows the state which removed the cover plate part (FIG. 5) in the electric water heater (electric pot) concerning Embodiment 1 of this invention. It is a perspective view which shows the structure of the vapor | steam collection | recovery unit attached to the cover body in the electric water heater (electric pot) concerning Embodiment 1 of this invention, and a pressure release passage unit part. FIG. 8 is a top and bottom exploded perspective view of a pressure relief passage unit portion shown in FIG. 7. It is a perspective view of the steam recovery unit portion shown in FIG. FIG. 10 is an exploded perspective view of the steam recovery unit shown in FIG. 9. It is explanatory drawing which shows the flow of the vapor | steam in the vapor | steam cooling channel | path in the vapor | steam recovery unit of the electric water heater (electric pot) concerning Embodiment 1 of this invention. It is explanatory drawing which shows the flow of the vapor | steam from the inner container side in the vapor | steam path | route of the X section enlarged view shown in FIG. 3, and the return state of dew condensation water. It is sectional drawing which shows the structure of the electric water heater (electric kettle) concerning Embodiment 2 of this invention. It is sectional drawing which shows the structure of the electric water heater (electric kettle) concerning Embodiment 3 of this invention.

<Embodiment 1>
Hereinafter, the configuration and operation of the electric water heater according to Embodiment 1 of the present invention will be described in detail with reference to FIGS. In this embodiment, an electric pot is employed as the electric water heater.

  This electric pot is provided with both functions of boiling water and keeping warm. For example, as shown in FIGS. 1 to 4, a container main body 1 including an inner container 3 for storing a liquid (water), and the container main body 1 A lid 2 that opens and closes the upper side opening, an electric heater 4 that is a heating means for heating the inner container 3 at the time of boiling and keeping warm, and for pouring hot water in the inner container 3 to the outside. A hot water supply passage 5, 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 in a state where an AC power supply is connected, and a drive operation of the hot water supply pump 6. A hot water supply operation lever 4 is provided. 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 in front of the container body 1 in the hot water supply passage 5.

  The container body 1 includes an outer case 7 made of a synthetic resin that constitutes an outer surface portion (in the case of the present embodiment, a rectangular tube shape), the inner container 3 that constitutes an inner surface portion, and the outer case 7. And the inner container 3 are integrally coupled and fixed on the upper side, and a synthetic resin annular shoulder member 8 to be mounted when the lid 2 is closed, and a synthetic resin dish constituting a bottom surface portion. The bottom member 9 has a shape. Reference numeral 10 denotes a transparent water amount viewing window provided at a position where the water amount pipe 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. 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 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 (outer cover) and a synthetic resin lower plate (inner cover) 12 whose outer peripheral edges are coupled to the upper plate 11. The shoulder member 8 is supported by a rear end portion 8a (see FIG. 3) via a hinge pin 13 and a hinge lock member 14 so that the shoulder member 8 can be opened and closed in a vertical direction and is detachable.

  Further, the lid 2 has an opening at a position other than the steam inlet 16 communicating with the inside of the inner container 3 and the upper surface of the lid 2 (for example, the lower surface of the right front end in the present embodiment). A steam cooling passage 15 meandering in a zigzag manner connecting to the steam outlet 17 (see FIG. 4) is formed. The steam cooling passage 15 is formed in a steam recovery unit 18 that is widely disposed in the lid 2 in a plan view as described below. And in order to promote the condensation effect by the cooling of the vapor | steam V which flows in the same vapor | steam cooling channel | path 15, between the said vapor | steam collection | recovery unit 18 and the upper board 11 of the cover body 2, it is a space part for thermal radiation and heat insulation. On the other hand, between the steam recovery unit 18 and the lower plate 12 of the lid 2, heat transfer from the lower inner container 3 is prevented and the steam recovery unit 18 is not heated. In addition, a heat insulating member 28 made of a heat insulating material such as foamed polystyrene that maintains the heat retaining performance of hot water in the inner container 3 is provided.

  If necessary, an aluminum foil or the like having a high heat dissipation 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), so that it flows in the steam cooling passage 15. The heat radiation effect from the vapor V to the air in the space 32 is further enhanced, and the condensation effect is also improved.

  As shown in FIGS. 6 to 11, for example, the steam recovery unit 18 is configured by integrally connecting a synthetic resin lower component member 18a and a synthetic resin upper component member 18b. A rectangular portion 19 located at the rear end of the semicircular portion (that is, the rear end side of the lid 2), a semicircular enlarged portion 20 located on the front side of the rectangular portion 19, and the other end of the enlarged portion 20 11 (for example, the lower left end in the plan view state of FIG. 11) and an extending portion 21 extending a predetermined length long from the front side of the lid body 2 (the lower side in the drawing).

  The steam inlet 16 portion described above is provided in a cylindrical shape downward from the lower surface side of the center of the rear end portion of the enlarged portion 20, and the steam outlet 17 is a tip portion of the extension portion 21. It is provided in a cylindrical shape facing downward on the lower surface side.

  That is, as shown in FIGS. 4, 7, 9, and 10, the steam outlet 17 extends in a cylindrical shape with a predetermined length downward, and has three flat ribs at the center of the tip side. The convex part 17a provided via the shoulder part 8 is fitted into the upper part of the cylindrical water stop valve SV part provided at the shoulder front end side corner part 8b part of the shoulder member 8 described above.

  And in the same insertion state, the said convex part 17a pushes down against the urging | biasing force of the urging | biasing spring S to the upper side valve closing direction of the cross-sectional T type valve body a of the water stop valve SV, and the cylindrical stop The steam passage 40 of the water valve SV is opened to the steam outlet 17 side of the steam cooling passage 15 (sixth cooling passage 15f).

  On the other hand, one end 41a of a flexible pressure release pipe 41 made of rubber, for example, is connected to the outlet portion 40a of the steam passage 40 on the water stop valve SV side. The shoulder member 8 is disposed so as to extend from the front portion of the shoulder member 8 to a lower position near the center portion of the lower opening member 42 that extends flat in front of a predetermined dimension. The extended end portion opens downward and communicates with an air outlet 44 for pressure release provided in the lower port cover member 43 assembled on the lower surface side of the lower port member 42. I'm hurt.

  The air outlet 44 is formed of an elliptical cylindrical body that is long in the left-right direction as shown in the figure, and a rectangular shape that is erected above a predetermined height in the horizontal direction at a predetermined interval in the outer periphery. The rib 45 is erected, and a dew condensation water storage pocket 45a for storing dew condensation water is formed around the air outlet 44 made of an elliptical cylindrical body.

  And the extended end part 41b of the said pressure release pipe 41 is formed in the same square fitting part fitted so that the condensed water storage pocket 45a may be covered.

  In the case of the present embodiment, the steam outlet 17 is opened toward the lower surface side of the lid body 2 and the water stop valve SV is associated with the lower portion thereof. As long as it is outside the body 2 and is located at a position other than the upper surface portion, it may be configured to open at any position (for example, a side surface portion).

  For example, as shown in FIGS. 10, 11, and 12, the steam cooling passage 15 allows the steam S introduced from the steam inlet 16 extending from the lower side to the upper side. The left first cooling passage 15a led substantially straight to the rear end side) and a U-turn from the rear end side to the right side of the first cooling passage 15a so that the rectangular portion is substantially extended to the rear end side of the front side enlarged portion 20. After extending straight, the second cooling passage 15b extending forward along the circumferential direction, and the third cooling passage 15c extending to the left and right sides at a substantially intermediate position in the front-rear direction of the enlarged portion 20 following the second cooling passage 15b. A fourth cooling passage 15d extending to the left and right sides of the enlarged portion 20 following the third cooling passage 15c, and a right and left at the front end portion (maximum diameter portion) of the enlarged portion 20 following the fourth cooling passage 15d. Between both ends Bill and fifth cooling passage 15e, consists sixth cooling passage 15f that following the fifth cooling passage 15e reaches the upper part of the steam outlet 17 portion extends to the front end portion of the projecting portion 21.

  In other words, the steam cooling passage 15 is likely to condense and condense when the steam V flowing through the portion of the steam cooling passage 15 efficiently exchanges heat (dissipates heat) with the air layer inside and outside (especially the upper surface side). In addition, when viewed from the entirety of the lid body 2, it is not the shortest distance between them from the steam inlet 16 side on the rear end side to the steam outlet 17 side on the front end side, but between the left and right end sides of the lid body 2. The zigzag shape is configured as a steam cooling passage with the longest possible distance that detours (meanders) several times over time.

  If it does in this way, the 1st-6th arrange | positioned widely in the cover body 2 by meandering between the right-and-left both ends side several times from the rear-end part side of the said cover body 2 to the front-end part side. The cooling passages 15a to 15f function as an effective cooling space for the steam V introduced from the steam inlet 16, and the passage of the introduced steam V from the first cooling passage 15a to the sixth cooling passage 15f. Effectively heat exchange (radiation) with the inside and outside air is efficiently condensed, and almost all the vapor is formed into droplets to form the condensed water W.

  Then, the condensed water W formed into droplets is refluxed in the reverse direction through the first to fifth cooling passages 15a to 15e inclined downward in the direction of the communication hole 23 of the lid 2 as described later, The second cooling passage 15b returns to the first cooling passage 15a via the u-turn portion 15U, and continues from the side of the steam inlet 16 through the steam inlet 12a of the lower plate 12 and the condensed water return port 26b of the inner cover member 26 to the inner container 3. (See FIG. 12).

  In this case, the dew condensation water W returned to the steam inlet 16 portion is further returned from the steam inlet 12a of the lower plate 12 to the bottom of the inner cover member 26, and an opening 26b provided in the bottom portion. , 26b, 26b are returned to the inner container 3.

  Further, in the case of the cooling passages 15a to 15f as described above, even if the electric pot falls to the left or right side, either one of the left and right zigzag cooling passages is on the upper side. Hot water will not leak.

  In this case, the communication portion (the rear end side vertical wall portion of the lower plate 12) between the first cooling passage 15a and the second cooling passage 15b on the rear end side of the lid body 2, that is, the U-turn of the two passages. A communication hole (steam / condensed water inlet / outlet) 23 for facing the pin-shaped steam sensor 22 attached to the side inner peripheral surface of the shoulder member 8 so as to detect the temperature of the steam V is formed in the portion 15u. Is formed between the outer peripheral edge portion of the communication hole 23 and the outer peripheral surface of the attachment portion of the steam sensor 22 on the shoulder member 8 side when the lid body 2 is closed. A seal packing 24 is provided for sealing.

  Then, the first cooling passage 15a and the second cooling passage 15b are communicated with each other in a U shape via the vapor sensor 22 only when the lid body 2 is closed. When the lid 2 is opened, the vapor V from the first cooling passage 15a passes through the communication hole 23 to the second cooling passage 15b, and the sixth, fifth, fourth, third and second cooling. The above-described condensed water W from the passages 15f, 15e, 15d, 15c, and 15b is recirculated into the inner container 3 through the flowing steam inlet 16 as described above.

  The left and right openings 19a (first cooling passages 15a) of the rear end side rectangular portion 19 of the steam recovery unit 18 are formed inside the communication hole 23 formed in the vertical wall portion of the lower plate 12 of the lid 2. (Steam outlet part), 19b (steam inlet of the second cooling passage 15b) are brought into contact with each other, and the outer periphery of the openings 19a, 19b is sealed with the inner lip part of the packing 24, thereby The first and second cooling passages 15a and 15b communicate with each other.

  Incidentally, the first to sixth cooling passages 15a to 15f of the steam recovery unit 18 are integrally provided on the upper surface of the above-described lower component member 18a of the steam recovery unit 18, as shown in FIGS. Further, a partition is formed by the molding step 25a and ribs (partition walls) 25b.

  The configuration of the steam cooling passage 15 is not limited to a zigzag meandering shape in the left and right directions in the plane direction as in the present embodiment, but is a substantially circular path that passes through the outer periphery of the lid body 2 or a passage that spirally bypasses in the plane direction. It can be deformed into various shapes such as a shape.

  In the case of this embodiment, the third cooling passage 15c includes a passage enlarged portion 15c1 that is located on the outlet side of the second cooling passage 15b and has a passage sectional area that is widened, and a right end side of the passage enlarged portion 15c1. And a trap portion 15c2 that traps the dew condensation water W when the electric pot is tilted forward or falls forward. The fourth cooling passage 15d is located on the outlet side of the third cooling passage 15c. A passage enlarging portion 15d1 having an enlarged passage cross-sectional area and a trap portion 15d2 which is located on the left end side of the passage enlarging portion 15d1 and traps the dew condensation water W when the electric pot is tilted forward or falls forward are formed. The cooling passage 15e includes a passage expanding portion 15e1 that is located on the outlet side of the fourth cooling passage 15d and has a passage cross-sectional area that is widened, and a right end side of the passage expanding portion 15e1 that is located in front of the electric pot. A trap portion 15e2 for trapping the dew condensation water W at the time of slanting or falling forward is formed, and the sixth cooling passage 15f is located on the outlet side of the fifth cooling passage 15e, and when the electric pot is inclined forward or forward A trap portion 15f2 for trapping the dew condensation water W at the time of falling, and a trap portion 15f3 for trapping the dew condensation water W at the time of forward tilting of the electric pot or at the time of front overturning are formed on the outlet side of the sixth cooling passage 15f. Yes.

  In the present embodiment, the passage expanding portions 15c1, 15d1, and 15e1 are configured such that the passage expands on the same plane as the third to fifth cooling passages 15c to 15e. The area may be widened, and the passage cross-sectional area may be widened in the vertical direction (that is, the depth direction).

  The steam recovery unit 18 is configured so that the second to fifth cooling passages 15b to 15e excluding the sixth cooling passage 15f and the first cooling passage 15a are closed when the lid 2 is closed. It is attached to the communication hole 23 (openings 19a, 19b of the rectangular portion 19) so as to be inclined downward at a predetermined inclination angle.

  On the other hand, in the same state, the first cooling passage 15a is formed so as to partially incline downward from the communicating hole 23 toward the steam inlet 16 in the opposite direction.

  If it does in this way, the dew condensation water W which the vapor | steam V which flows through the 1st-6th cooling channel | paths 15a-15f condenses will first cool through the communicating hole 23 part (U-turn part 15U) of the cover body 2 first. It is easy to recirculate into the inner container 3 through the passage 15a and from the first cooling passage 15a through the steam inlet 16, the steam inlet 12a of the lower plate 12, and the steam return ports 26b, 26b,. .

  Further, when the second to fifth cooling passages 15b to 15e are inclined as described above, the upper plate 11 of the lid 2 and the steam recovery unit 18 can be seen as apparent from FIGS. Between the first to fifth cooling passages 15a to 15e, an effective heat radiation and heat insulation space 32 is formed in which the interval in the vertical direction becomes larger toward the upstream side of the passage (the rear end side of the steam recovery unit 18). It will be.

  The space 32 has a higher heat dissipation capability with respect to the steam V flowing in the first, second, and third cooling passages 15a, 15b, and 15c having a higher temperature and lower degree of condensation toward the upstream side. While functioning as a large effective cooling air layer, it functions as an effective heat insulation space portion that prevents the heat of high-temperature steam from being transmitted to the upper plate 11 portion of the lid 2.

  That is, the steam flowing in the first to sixth cooling passages 15a to 15f has a higher temperature and a lower degree of condensation on the upstream side.

  Therefore, in this part, heat is exchanged with a sufficient amount of air (including outside air that has entered through the gap between the lids 2) with a sufficient temperature difference to condense and form droplets as much as possible. Insulate as effectively as possible so that the temperature of the plate 11 portion does not increase.

  On the other hand, when going downstream, the temperature of the steam flowing in the cooling passage is lowered and the condensation is also progressing. Therefore, it does not necessarily require a large amount of air, and is condensed by effective heat exchange with a certain amount of air. In addition to promoting the action, heat insulation with the upper plate 11 is also made just in case.

  According to these configurations, most of the steam V is condensed and recovered up to the fifth cooling passage 15e, and the temperature of the passage decreases to a substantially safe low temperature.

  For this reason, when reaching the sixth cooling passage 15f in the final stage, the steam is almost lost, and the air pressure from the steam outlet 17 to the stop valve SV side is substantially the air pressure accompanying the increase in internal pressure (in FIG. 10). (See broken line arrow).

  Therefore, a small gap as shown in the figure is sufficient for the gap between the upper plate 11 in the same portion, and it is not necessary to install a space as a heat insulating space.

  The air pressure finally released from the steam outlet 17 into the pressure release pipe 41 through the water stop valve SV is supplied to the above-described air outlet 44 portion at the end of the pressure release pipe 41 to be the lower port cover member. It is discharged below 43.

  In this case, when the condensed water is contained in the discharged air even a little, the water is stored in the dew condensation water storage pocket 45a.

  Reference numerals 50, 50... Are support columns for the upper plate 11 erected on the upper surface side of the steam recovery unit 18.

  Further, as described above, on the lower surface side of the lower plate 12 in the lid body 2, a metal inside provided with steam inlets 26 a, 26 a... And condensed water return ports 26 b, 26 b. A cover member 26 is fixed, and an outer peripheral edge (entire circumference) of the inner cover member 26 is made of a heat-resistant rubber that is pressed against the upper end side opening of the inner container 3 when the lid 2 is closed. A seal packing 27 is provided.

  The steam inlets 26a, 26a,... Are formed in the top plate portion of the convex portion that is convex upward in the shape of a trapezoidal cross section and is also higher near the bottom of the outer periphery, while the condensed water return port 26b , 26b,... Are formed in a lower bottom portion.

  Therefore, even when the dew condensation water W is returned, the steam inlets 26a, 26a,... Are always open, so that smooth steam can be introduced.

  1, 5, and 6, reference numeral 29 denotes a lid opening / closing lever for operating the opening / closing state of the lid body 2, 29 a and 29 a are locking engagement pieces, and reference numeral 30 in FIGS. An operation panel unit 31 having an operation surface of switches and a display surface of liquid crystal display means is a handle used when carrying the electric pot.

  By configuring as described above, as shown in FIG. 11, after the boiling of the inner cover 26 starts, the steam is recovered through the steam inlets 26a, 26a... At the lower part of the lid 2 and the steam inlet 12a of the lower plate 12. The steam V from the inner vessel 3 led to the steam inlet 16 of the unit 18 flows in the steam cooling passage 15 (15a to 15f) toward the steam outlet 17 side (see FIG. 11), first, the first cooling passage. The steam temperature is detected by the steam sensor 22 immediately after leaving 15a. At the same time, it is immediately determined that the water has boiled, and the electric heater 4 is immediately turned off so that no steam is emitted.

  Therefore, according to the same configuration, boiling detection can be performed much earlier than boiling detection by the bottom sensor that detects the temperature of the bottom portion of the conventional inner container 3, and heating by the electric heater 4 immediately after the boiling starts. Is stopped, the steam generated from the hot water in the inner container 3 is extremely reduced and energy is saved.

  Thereafter, the steam V makes a U-turn at the steam sensor 22 portion and enters the third cooling passage 15c from the second cooling passage 15b. The pressure is reduced and the passage is expanded at the passage expanding portion 15c1 portion of the third cooling passage 15c. Condensation is accelerated by cooling with the internal air. Thereafter, also in the process of flowing through the fourth cooling passage 15d and the fifth cooling passage 15e, the pressure is similarly reduced in the passage expanding portions 15d1 and 15e1, respectively, and the air is cooled by the air in the passage, thereby condensing. Therefore, in the process of flowing from the first cooling passage 15a through the second, third, fourth, fifth, and sixth cooling passages 15b, 15c, 15d, 15e, and 15f, almost all the steam V is condensed and the condensed water W Thus, almost no steam is discharged from the steam outlet 17.

  The condensed water W condensed in each of the first to sixth cooling passages is substantially steam-cooled in which the entire body is inclined downward toward the steam inlet 16 side communication hole 23 when the lid body 2 is closed. The steam flows through the passage 15 in the opposite direction to the steam V, passes through the second cooling passage 15b through the u-turn section 15U, and from the u-turn section 15U through the first cooling passage 15a, into the steam inlet 16, the steam inlet 12a of the lower plate 12, and the inside The condensed water is returned to the inner container 3 through the condensed water return ports 26b, 26b,.

  Moreover, in the above structure, between the steam inlet 16 communicating with the inside of the inner container 3 and the steam outlet 17 communicating with the outside of the lid 2 as described above, from the steam inlet 16 side to the steam outlet 17 side direction. Heat insulation that insulates between the steam cooling passages 15a to 15f and the upper opening of the inner container 3 on the lower side of the steam cooling passages 15a to 15f that condense the steam V in the passage while detouring in the plane direction. Since the member 28 is provided, the heat of the hot water in the inner container 3 is prevented from being transmitted to the steam cooling passages 15a to 15f via the lid body 2, and the steam in the steam cooling passages 15a to 15f is more reliably secured. While a cooling function is ensured, the heat insulation function prevents a drop in the hot water temperature in the inner container 3, and a sufficient heat retaining performance is maintained.

  Therefore, both a sufficient heat retaining function and a steamless function are realized at the same time.

  Further, in the above configuration, in that case, a space for heat dissipation and heat insulation is provided in the upper part of the steam cooling passages 15a to 15f in the lid 2 as a heat insulating part having a heat insulating power smaller than that of the heat insulating member 28 on the lower side. A part 32 is provided.

  According to such a configuration, the heat insulating performance of the lid body 2 as a whole is improved as much as possible by two sets of upper and lower heat insulating portions, and the heat retaining function as an electric pot is improved, while the steam cooling passages 15a to 15f Effective vapor condensation performance can be ensured.

  Further, even if a person touches the upper plate 11 portion having a high temperature such as the upstream portions of the steam cooling passages 15a to 15f, it is not necessary to feel the heat.

  Further, in the above configuration, the steam cooling passages 15a to 15f function as a heat insulating part having a heat retaining performance improving effect.

  As described above, high-temperature steam introduced from the inner container 3 side flows widely from the steam inlet 16 side toward the outlet 17 side in the steam cooling passages 15a to 15f. Accordingly, the steam cooling passages 15a to 15f are originally much higher in temperature than the surrounding members, and serve to heat the heat insulating member 28 provided on the lower side thereof from the upper side.

  For this reason, compared with a mere heat insulation member, the heat retention function improvement effect is much higher, and the heat retention performance of the hot water in the inner container is more effectively improved in the lid 2 portion.

  Furthermore, in the above configuration, in those cases, particularly, the steam cooling passages 15a to 15f are a complete passage from the steam inlet 16 to the steam outlet 17, and the steam inlet 16 side u-turn section in the middle thereof A steam sensor 22 as a steam detector is provided at the 15U position.

  According to such a configuration, unlike the conventional steam detection (boiling detection) method, the steam inlet is different from the configuration in which the steam detection passage is formed separately from the steam discharge passage to detect the steam (boiling detection). All of the steam introduced from the gas passes through the steam detector, so that the steam detection accuracy is improved and the response of boiling detection is greatly improved.

  Therefore, it becomes possible to quickly turn off the heating means such as an electric heater in accordance with the start (detection) of boiling, and the amount of steam generated by boiling can be limited to the smallest possible amount.

  For this reason, a steam-less state can be realized more effectively, and unnecessary power consumption can be avoided.

  As a result, according to the present invention, it is possible to provide a high-performance electric pot with high heat retention performance and high energy-saving effect at a low cost while having an almost complete steam-less structure.

<Embodiment 2>
Next, FIG. 13 has shown the structure of the electric water heater which concerns on Embodiment 2 of this invention.

  Recently, in place of the electric pot of the first embodiment which needs to be energized at all times, the heating means can be energized simply and quickly only when hot water is required. Such an electric kettle is useful as an energy-saving hot water heater.

  The electric kettle includes a liquid container containing water and a water heater body provided with an electric heating means for heating the liquid container, and the water heater body is detachably mounted. In a state where the main body is placed, the power supply unit includes a power supply unit including a power supply unit that supplies power to the power receiving unit of the heating unit on the water heater main body side.

  Then, for example, when boiling is performed and then the boiling state is reached, it is detected by a steam sensor for detecting boiling steam (for example, a bimetal, a thermistor, etc.), and the above power supply unit quickly supplies the above The water heater is turned off by turning off the power supply to the water heater body side water heater.

  Even in the case of such an electric kettle, a considerable amount of steam is generated at the time of boiling. Therefore, there is exactly the same problem as in the case of the electric pot described above, and it is desired to reduce the amount of generated steam as much as possible.

  This embodiment is configured from such a viewpoint, and an electric kettle as described above is adopted as an electric water heater.

  That is, the electric kettle of this embodiment includes a container main body 61 provided with a liquid container 60 for hot water storage inside, a lid 62 that opens and closes the upper side opening of the container main body 61, and the liquid container 60 is heated. From the upper end to the back of the outer case 61A of the container main body 61, a flat C-shaped water heater 63 which is a heating means for heating at times, a hot water outlet 64 for supplying hot water in the liquid container 60 to the outside, A side U-shaped handle portion 65 that is integrally attached so as to extend toward the lower end side is provided.

  The container main body 61 includes a synthetic resin cylindrical outer case 61A having a bottom member 61a, and a synthetic resin annular shoulder member 61b provided around the entire upper end of the container, and the inner side of the shoulder member 61b. The upper end (opening edge) of the liquid container 60 is supported via the container locking portion.

  The liquid container 60 is formed of, for example, a single-plate stainless steel bottomed cylindrical tube, and the water heater (seeds heater) 63 extends in the circumferential direction on the outer periphery of the bottom surface of the bottom portion 60a. It has been.

  In this case, the hot water heater 63 has a flat C-shaped heater embedding convex portion 63b having a predetermined height on the lower side of the inverted trapezoidal cross section on the outer periphery of the heater plate 63a having a flat central portion and good heat conductivity. The heater is embedded in the heater burying convex portion 63b. At both ends thereof, power supply lead terminals for connecting power supply lead wires, which are power supply wirings, are provided so as to protrude from both ends of the heater embedding convex portion 63b (not shown).

  On the other hand, on the lower surface side of the heater plate 63a, a cylindrical body is located on the inner peripheral side of the heater embedding convex portion 63b and is composed of a power receiving rod-like electrode, a sleeve-like electrode, and a sleeve-like insertion / removal guide tube. A first power supply substrate (detailed structure is not shown) provided with a power receiving coupler 66 is provided.

  At the end of the first power supply board on the side of the handle 65, a power connector terminal is provided for connection to the power supply lead terminals at both ends of the water heater 63 via lead wires. The power connector terminal is an open / close contact of an ON / OFF operation lever switch 67 on the upper end side of the handle portion 65 via a wiring space 65a in the handle portion 65 via a power lead wire which is a power supply wiring. The bimetal switching contact portion of the vapor sensor (boiling detection sensor) 70 is connected in series with each other, and the bimetal switching contact portion is connected to the wiring space 65a in the handle portion 65 via a lead wire as a power supply wiring. Is connected to a power lead terminal at one end of the water heater 63.

  The power connector terminal on the first power supply board side is connected to the power supply lead terminal on the other end side of the water heater 63 through a power supply lead wire which is a power supply wiring.

  Next, the lid 62 includes a synthetic resin upper plate 62a, a synthetic resin lower plate 62b having an outer peripheral edge coupled to the upper plate 62a, and a metal inner cover member 62c below the synthetic resin lower plate 62b. It is configured to be detachably fitted in the vertical direction to the opening inside the shoulder member 61b.

  Between the upper plate 62a and the lower plate 62b, a space having a desired width in which the heat insulating material 28 and the steam recovery unit 88 can be installed is formed, and the handle portion 65 side boiling detection passage 84 portion thereof is formed. Is provided with a steam sensor 70.

  The lower plate 62b portion of the lid body 62 is formed, for example, as a whole in a hat shape in cross section, and the main body portion is formed in a cylindrical body having a predetermined depth corresponding to the opening diameter of the inner container 60.

  A concave groove 80 is formed in the lower surface side portion of the cylindrical body portion. The concave groove portion 80 is recessed to the lower side of a predetermined diameter, the central portion of which is displaced by a predetermined dimension from the central portion of the lower surface of the cylindrical body portion. Is formed.

  The recessed groove 80 is filled with a heat insulating material 28 such as polystyrene foam.

  And the vapor | steam collection | recovery unit 88 mentioned above is installed in the upper part side.

  A cylindrical steam inlet 81 extending from the lower side to the upper side is integrally formed on the rear end side (the grip portion 65 side) of the concave groove portion 80 of the lower plate 62b. The upper end opening of the steam inlet 81 is connected to the shoulder member 61b and the handle attachment portion 83 side boiling detection passage 84 via a connection pipe 82 bent in an angle toward the rear.

  The boiling detection passage 84 is a U-turn passage that turns to the side at the handle attachment portion 83 portion, and the downstream side opening of the boiling detection passage 84 is the first lower steam cooling side of the steam recovery unit 88 via packing. The passage 88a communicates with one end side (entrance portion).

  The boiling detection steam sensor 70 is installed on the upper surface side of the center of the u-turn part of the boiling detection passage 84.

  On the other hand, the steam recovery unit 88 has a first steam cooling passage 88a extending from the boiling detection passage 84 side to the hot water pouring outlet 64 side and an extending end side of the first steam cooling passage 88a to the grip portion 65 side again. It comprises a plurality of bypassed steam cooling passages with the upper-side second steam cooling passage 88b, and the lower surface side thereof is insulated by the heat insulating member 28 such as polystyrene foam as described above. Heat from the hot water on the 63 side is not transmitted, and the upper surface side is open to the heat radiation and heat insulating space 85 side formed between the upper plate 11.

  Therefore, the steam V introduced into the first and second steam cooling passages 88a and 88b is not affected by the heat from the inner container 60 side as in the case of the electric pot of the first embodiment described above. Then, it is effectively cooled and condensed to form dew condensation water W.

  Here, the first steam cooling passage 88a is inclined upward from the handle portion 65 side toward the hot water pouring outlet 64 side, while the second steam cooling passage 88b is directed from the hot water pouring outlet 64 side toward the grip portion 65 side. It is installed in the form of rising and tilting. Therefore, the dew condensation water W generated by the condensation of the steam V returns in the direction opposite to the traveling direction of the steam V (two-dot chain arrow) (solid arrow), and the steam inlet 81 from the u-turn portion of the boiling detection passage 84. Then, the condensed water return ports 93b, 93b,... Of the inner cover member 62c described below are returned into the inner container 63.

  That is, on the lower side of the lower plate 62b in the lid 62, a metal inner cover member provided with steam inlets 93a, 93a,... And condensed water return ports 93b, 93b,. 62c is fixed to the outer peripheral edge (entire circumference) of the inner cover member 62c, and a seal packing made of heat-resistant rubber that is pressed against the upper end side opening of the inner container 60 when the lid 62 is closed. 97 is provided.

  The steam inlets 93a, 93a,... Are located at the center of the flat part, and the condensed water return ports 93b, 93b,. , Formed on the bottom surface of the recess that is lower than the outer periphery.

  Therefore, even when the dew condensation water W is returned, the steam inlets 93a, 93a,... Are substantially open, and the smooth steam V can be introduced.

  The other end of the second steam cooling passage 88b of the steam recovery unit 88, that is, the downstream end, is a handle attachment portion 83 portion and descends downward in the rear end side of the main body case 61A. It is connected to an upper end 89a of a pressure relief passage 89 that is open to the outside at a part (air outlet 89b) via packings P1 and P2.

  Other configurations are basically the same as those of the electric pot of the first embodiment.

  Therefore, according to the above configuration, in the case of an electric kettle, it is possible to realize the same steam-less function as in the case of the electric pot.

  In that case, the heat insulation and heat insulation performance of the lid 62 can be improved in the same manner. Therefore, as long as the structure for improving the heat insulation function on the main body case 61A is adopted, the heat insulation function is provided in the electric kettle. It is also possible to do.

  In FIG. 13, reference numeral 90 denotes a hot water supply lock switch that opens and closes a valve body that opens and closes the inlet portion of the inner hot water pouring passage 68 for hot water supply, and reference numeral 100 corresponds to the power receiving coupler 66 on the container body 61 side. It is a power supply stand for electric power supply provided with the electric power feeding coupler 101 to perform.

<Embodiment 3>
Next, FIG. 14 has shown the structure of the electric water heater which concerns on Embodiment 3 of this invention.

  In this embodiment, in the same electric kettle as that of the second embodiment, an air outlet 96 for pressure release is opened on the top surface of the lid body 62, and an end side opening 88c of the second steam cooling passage 88b is formed. The air outlet 96 is provided corresponding to the air outlet 96, and does not require the long pressure release passage 89 from the upper side to the lower side as in the second embodiment.

Even in such a configuration, since the steam is sufficiently recovered in the first and second steam cooling passages 88a and 88b of the steam recovery unit 88, the air outlet 96 on the top surface side of the lid body 62. Since not much steam is emitted from the portion, it is possible to realize a substantially similar steam-less function.
(Modification)
The invention of the present application is not limited to the configuration described in each of the above embodiments, and it is needless to say that the design can be changed as appropriate without departing from the gist of the invention.

1 is a container body 2 is a lid 3 is an inner container 4 is an electric heater (heating means)
15 is a steam cooling passage 15a is a first cooling passage 15b is a second cooling passage 15c is a third cooling passage 15d is a fourth cooling passage 15e is a fifth cooling passage 15f is a sixth cooling passage 15u is a u-turn section 16 is a steam inlet 17 Is a steam outlet 28 is a heat insulating member 32 is a space portion 61 is a container body 62 is a lid,
70 is a steam sensor 88 is a steam recovery unit 88a is a first steam cooling passage 88b is a second steam cooling passage 89 is a pressure release passage 89b is an air outlet 100 is a power supply stand V is steam W is condensed water

Claims (1)

A container main body provided with an inner container for storing liquid and a heating means for heating the inner container; a lid mounted on the shoulder of the container main body to cover the upper side opening of the container main body ; and the lid lid outside the lid body be in the rear and the steam inlet communicating with the interior of the inner container, and in the front end of the lid in pairs towards the portion except for the hot water supply passage of the container body from the cap body a steam outlet opening to, after be in the lid body through the boiling detection section of the lid rear end from the steam inlet side lid rear between said steam inlet and said steam outlet, the steam outlet It consists of a steam cooling passage that rises in the direction of the front end of the lid and condenses steam while detouring in both the left and right directions of the lid, and the steam outlet is at the highest position in the up and down direction of the steam cooling passage that slopes up provided Rutotomoni, toward the shoulder portion of the lower container body Electric kettle, characterized in that to the mouth.

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