JP6197166B2 - Electric water heater - Google Patents

Description

  The present invention relates to a configuration of an empty detection mechanism in an electric water heater such as an electric kettle.

  Recently, it is equipped with a heat insulation heater, and by always energizing the heat insulation heater, it changes to an electric kettle with a heat insulation function that can use hot water at a desired temperature at any time. Many electric kettles that are boiled and eliminate waste of power consumption due to continued energization are used.

  Such an electric water heater is required to boil hot water as soon as possible, that is, to have high heating efficiency.

  However, conventional electric water heaters generally have a structure in which a sheathed heater is brazed to the bottom of an inner container made of stainless steel through an aluminum plate having good heat transfer, and the bottom of the inner container is directly heated. Therefore, the actual situation is that the heating efficiency is not necessarily good (see Patent Document 1 and Patent Document 2).

  Therefore, in order to improve this, for example, as seen in some overseas products, a heater is placed on the bottom of the inner container by installing a sheet heater directly on the bottom of the inner container by means such as printing. Can also be integrated (see Patent Document 3 and Patent Document 4).

  When such a configuration is employed, the heating is directly performed by the planar heater with which the bottom of the inner container is in wide contact, so that the heating efficiency is extremely improved and the time for boiling the water is greatly shortened.

  In any case of these electric water heaters, the heater unit is provided with an emptying detection means such as a bimetal, and the emptying state at the bottom of the inner container is detected (for example, Patent Document 1, (See the bimetals of Patent Document 3 and Patent Document 4).

JP 2011-240075 A JP 2009-125356 A Japanese National Patent Publication No. 09-507395 Japanese Translation of National Publication No. 09-506792

  However, when the heating structure using the planar heater as described above is adopted, it is advantageous that the heat response of the heater section and the heating efficiency for the inner container are extremely high, but on the other hand, because the heating power is strong, Such a problem arises.

  That is, when the container main body is connected to the power base and the hot water is being boiled, the container main body is separated from the power base, tilted to a horizontal state, and hot water is poured out, The upper half of the bottom of the inner container where the planar heater is provided does not come into contact with hot water, and even if no power is supplied, the temperature rises considerably due to the highly efficient heating of the planar heater up to that point. Overshoot occurs. When the temperature becomes equal to or higher than the empty detection temperature, a partial empty state occurs.

  However, in the configuration of the conventional example described above, the emptying detection means such as the bimetal for detecting emptying is provided only at the center of the inner container bottom or at the outlet side, and even when pouring hot water. Since it corresponds to the portion in contact with the hot water in the inner container, it was not possible to detect the partial emptying state of the inner container portion not in contact with such hot water.

  Therefore, when pouring of hot water is finished and the container body is returned to the power supply stand again, it was in the middle of boiling water, so the supply of power to the planar heater was continued and the inner container was kept in a boiling state. The hot water is continuously heated.

  In this case, if the remaining amount of hot water is large, it may be left as it is, but if the remaining amount of hot water is small and the entire bottom of the inner container is nearly empty, the bottom portion that has not been in contact with the hot water In the partially empty state where the temperature is high, the sheet heater starts to be heated at a high temperature, undergoes a very large heat load, deforms the bottom plate part, and damages the applied fluororesin ( There is a risk of burning, burning, a decrease in water repellency, discoloration, mineral adhesion, deterioration of foam loss, etc.).

  The present invention has been made to solve such a problem, and the container is provided by providing an empty scooping detection means corresponding to a portion that does not come into contact with hot water at the time of pouring hot water at the bottom of the inner container. It is an object of the present invention to provide an electric water heater that can reliably detect a partial emptying state of the bottom of an inner container at the time of pouring hot water separated from the power supply stand.

In order to solve the above-described problems, each invention of the present application includes the following problem solving means.
(1) Means for Solving the Problems of the Invention of Claim 1 In the electric water heater of the present invention, a container body that houses and supports the inner container and has a power receiving part on the bottom side, and a handle provided at the rear part of the container body A lid that closes the opening of the upper part of the inner container and the upper part of the inner container, a hot water outlet provided at the upper front side of the container body, and a bottom part of the inner container and Heater for boiler, a dry frying detecting means provided in correspondence with the Heater of the inner container bottom is connected to the power receiving unit and any of the container body, the upper via the same power receiving unit Kihi In an electric water heater comprising a power supply stand having a power supply unit for supplying power to a heater, etc., the emptying detection means is made to correspond to a portion that does not come into contact with hot water when pouring hot water at the bottom of the inner container. When the hot water is poured out, the container body is separated from the power supply stand. In addition to being able to detect a partial emptying state of the bottom of the inner container, the amount of heat generated by the heater is in contact with hot water when pouring hot water and in a portion where hot water is not in contact with hot water when pouring, It is characterized by having different calorific values .

According to this problem-solving means, the adoption of or not a hot water boiling and heater, heating efficiency of the inner container containing water is greatly improved, kettle time is greatly reduced.

  Moreover, the emptying detection means is provided corresponding to a portion that does not come into contact with hot water at the time of pouring hot water at the bottom of the inner container, and the content at the time of hot water pouring is separated from the power supply stand. It is possible to reliably detect a partial empty state such as a region on the upper side of the vessel bottom.

As described above as a problem of the conventional example, while the container main body is connected to the power supply base and the hot water is being boiled, the container main body is separated from the power supply base and tilted to a horizontal state. When There will as dispensed, typically, the upper half side of the inner vessel bottom upper Kihi over data is provided longer in contact with the hot water, even without supply of power, the planar heater so far Due to the highly efficient heat generation, an overshoot of a considerable temperature rise occurs. When the temperature becomes equal to or higher than the empty detection temperature, a partial empty state occurs.

  However, in the conventional configuration, the emptying detection means for detecting emptying is provided at the center part of the inner container bottom or on the outlet side, and the part that is in contact with the hot water in the inner container even when pouring hot water Therefore, it was not possible to detect the empty state of the inner container portion that is not in contact with such hot water.

Therefore, ends hot water pouring is, when the container body is returned on the power base again, since was the middle kettle until the until the power supply to paralysis over data is continued, the boil Heating of the hot water in the inner container is continued.

In this case, if the remaining amount of hot water is large, it may be left as it is. However, if the remaining amount of hot water is small and the state is close to emptying, the bottom portion that was not in contact with the hot water becomes the above high temperature. remain partially dry frying state, further results in the high-temperature heating is started by Heater in large by the heat load, the deformation of the bottom plate portion, damage to the coated fluororesin (burnt, burning, repellent Aqueous deterioration, discoloration, mineral adhesion, deterioration of foam loss, etc.) occur.

  However, in the problem solving means of the present invention, as described above, the emptying detection means is provided corresponding to a portion that does not come into contact with hot water at the time of pouring hot water at the bottom of the inner container, and the container body is A partial emptying state such as an upper region of the bottom of the inner container at the time of pouring hot water separated from the power supply stand is also reliably detected.

Therefore, according to the configuration, while the container main body is on the power supply stand and the hot water is being boiled, the container main body is separated from the power supply stand, tilted to a horizontal state, and hot water is poured out. as will be, above the upper half side of the inner container bottom Heater is provided is not in contact with the hot water, the highly efficient heating of Heater in the meantime, the overshoot of the temperature rise occurs, partial becomes the air-fuel-fired state, the air-fired state is detected quickly, the power supply circuit to the upper Kihi chromatography data is interrupted.

As a result, thereafter, be returned container body to power base side, and lowers the temperature of the inner container bottom, until dry frying detecting means is reset, never as Heater is heated, The conventional problem does not occur.

Further, in the electric water heater of the present invention, the amount of heat generated by the heater at the bottom of the inner container is different from the heat generated at the portion that contacts the hot water when pouring hot water and the portion that does not contact the hot water when pouring hot water. It is also characterized by the amount.

  According to such problem solving means, for example, the heating value of the heater at the bottom portion of the inner container that does not come into contact with hot water when pouring hot water is made larger than the heat value of the portion that comes into contact with hot water even when pouring hot water. In such a case, the partial empty state can be generated more quickly and the power supply circuit can be shut off more quickly.

  In addition, it is possible to detect boiling earlier by providing a boiling detection unit at the corresponding lid position above the portion with the same calorific value. It is possible to realize power saving and high steam-less function.

Further, since the total amount of steam generated thereby is greatly reduced, deterioration of synthetic resin parts and the like are also reduced.
(2) Means for Solving the Problems of the Invention of Claim 2 In the electric water heater of the present invention, the container body that houses and supports the inner container and has the power receiving part on the bottom side, and the handle provided at the rear part of the container body A lid that closes the opening of the upper part of the inner container and the upper part of the inner container, a hot water outlet provided at the upper front side of the container body, and a bottom part of the inner container and Heater for boiler, a dry frying detecting means provided in correspondence with the Heater of the inner container bottom is connected to the power receiving unit and any of the container body, the upper via the same power receiving unit Kihi In an electric water heater comprising a power supply stand having a power supply unit for supplying power to a heater, etc., the emptying detection means is made to correspond to a portion that does not come into contact with hot water when pouring hot water at the bottom of the inner container. When the hot water is poured out, the container body is separated from the power supply stand. It is possible to detect a partial emptying state at the bottom of the inner container , and the amount of heat generated by the heater is more in contact with hot water at the time of pouring hot water than the amount of heat generated at the portion in contact with the hot water at the time of pouring hot water. It is characterized in that the calorific value of the part that disappears is larger .

  According to such problem solving means, the amount of heat generated by the heater in the bottom portion of the inner container that does not come into contact with hot water when pouring hot water is larger than the amount of heat generated in the portion that comes into contact with hot water when pouring hot water. The partial emptying state occurs more rapidly, and the power supply circuit can be shut off more quickly.

  In addition, by providing a boiling detector at the corresponding lid position above the portion that does not come into contact with hot water when pouring hot water with a large calorific value, it is possible to detect boiling earlier, Water heating, early power shutdown, power savings, and high steam-less functions can be realized.

  Further, since the total amount of steam generated thereby is greatly reduced, deterioration of synthetic resin parts and the like are also reduced.

Note that even if the container body is returned to the power supply side, the temperature of the bottom of the inner container is lowered and the heater is not heated until the emptying detection means is reset. This is the same as the first invention.
(3) Means for Solving the Problems of the Invention of Claim 3 In the electric water heater of the present invention, in the problem-solving means of the invention of claim 1 or 2 , the portion that comes into contact with hot water during hot water pouring is the hot water of the container body. The portion that is on the outlet side and does not come into contact with hot water when pouring hot water is the handle side of the container body.

The container body is connected on the power base, in the middle of the hot water is boiled, the container body is separated from the power base, tilted in a horizontal state, so that the hot water is dispensed, usually, the upper Symbol heat grip portion side of the inner container bottom over data are provided is not in contact with water, even without power supply, whereby high-efficiency heat generation on Kihi over data to, the considerable rise in temperature over Shooting occurs. When the temperature becomes equal to or higher than the empty detection temperature, a partial empty state occurs.

  Therefore, in such a case, if the empty scooping detection means is provided corresponding to the region on the handle portion side that does not come into contact with hot water when pouring hot water at the bottom of the inner container, the container main body is separated from the power supply base. Thus, it is possible to reliably detect the emptying state of the same region portion at the bottom of the inner container when pouring hot water. As a result, the conventional problem can be effectively solved as well.

  As a result of the above, according to the present invention, according to the amount of hot water in the inner container, a partial emptying state that occurs in the bottom portion of the inner container when pouring hot water is reliably and promptly detected in advance. Since the container body can be returned to the power supply stand after turning off the power, the problem of unnecessary heating is eliminated until the actual emptying occurs as in the past, and the electricity is more reliable and durable. A water heater can be provided.

It is sectional drawing of the right half side which shows the whole structure in the lid closed state of the electric water heater which concerns on embodiment of this invention (the figure which mounted and integrated the container main body on the power supply stand). It is a bottom view which shows the structure of the electrical equipment part in the container main body bottom part which removed the bottom member of the electric water heater, the wiring layout, etc. (the figure which abbreviate | omits the heater arrangement pattern). It is a bottom view which shows the attachment structure of the hot water heater arrangement | positioning pattern in the inner container bottom part of the same electric water heater, and an electrical equipment part. It is a bottom view which expands and shows the structure of the electrical equipment part provided in the inner container bottom face part of the same electric water heater. It is sectional drawing which shows the structure of the bottom plate in the inner container of the same electric water heater, and an inner container bottom part, a water heater, an electrical equipment mounting bracket, a receiving coupler, and an emptying detection bimetal part. It is an expanded sectional view which shows the structure of the thermostat part for safety | security in the inner container bottom part of the same electric water heater. It is a perspective view of the inner container which shows the installation state of the electrical equipment part mounting bracket, bottom member mounting bracket, and thermostat mounting bracket with respect to the bottom plate of the inner container bottom of the electric water heater. It is a side view of the whole inner container which shows the attachment state of the electrical equipment part attachment metal fitting with respect to the bottom plate and bottom plate in the inner container bottom part of the same electric water heater. It is a bottom view which shows the arrangement pattern and positional relationship of the water heater in the bottom face part of the inner container of the electric water heater in relation to the hot water outlet (lower opening part) and the handle position of the container body.

  Hereinafter, an embodiment for carrying out an electric water heater of the present invention will be described in detail with reference to the accompanying drawings.

First, in FIG. 1 to FIG. 9, there is shown an overall configuration of an electric water heater main body according to an embodiment for carrying out the electric water heater of the present invention and a configuration of an electrical component part including a water heater at the bottom of the inner container. It is shown.
(Configuration of electric water heater body)
That is, the electric water heater of this embodiment includes, for example, as shown in FIGS. 1 and 2, a container main body 1 having an inner container 3 for hot water storage on the inside, a lid 4 on the upper part, and a handle 8 on the rear part. The container body 1 is detachably mounted and includes a power supply stand 2 that supplies power to the power circuit of the electrical component part of the container body 1 in the mounted state.

The container body 1 includes, for example, a metal cylindrical case 1a which is an exterior body, a synthetic resin dish-shaped bottom member 1b fitted and integrated with the bottom of the cylindrical case 1a, and the cylindrical shape. An annular shoulder member 1c made of synthetic resin fitted and fixed to the upper end side opening of the case 1a, and a flange on the outer peripheral side of the opening through an engagement step 1d provided inside the annular shoulder member 1c By suspending and supporting the portion 3a, the inner container 3 housed and integrated inside the cylindrical case 1a and the bottom member 1b and the inner side of the annular shoulder member 1c are detachably fitted, The lid 4 having a considerable thickness in the vertical direction for opening and closing the opening of the inner container 3; and a water heater 5 provided on the bottom surface of the inner container 3 for heating the inner container 3 when boiling. An electrical component having a power supply circuit for driving and controlling the water heater 5 A hot water outlet (lower opening) 7 for pouring hot water in the inner container 3 provided at the front end (left side in FIG. 1) of the shoulder member 1c, and the cylindrical case A side U-shaped handle for pouring hot water in the rear end portion (right side portion in FIG. 1) of 1a and formed or attached in a state extending from the shoulder member 1c to the lower end portion of the cylindrical case 1a. 8.
(Configuration of inner container)
As shown in FIGS. 5 to 8, for example, the inner container 3 includes a cylindrical body portion 31 made of stainless steel (synthetic resin is also possible) having a substantially equal diameter with a single plate structure, and a bottom side opening of the cylindrical body portion 31. The bottom plate 32 is made of a stainless steel base plate (slightly thicker) 32 that is welded and integrated with the outer periphery closed so as to close the opening. It has been. The bottom plate 32 has an annular ring-shaped flat portion 32a having a predetermined width corresponding to a joining flange portion having a predetermined width provided on the inner periphery of the bottom side opening of the cylindrical body portion 31, and is slightly lowered on the inside. A spherical surface portion 32b having a concave concave spherical shape toward the upper side, and the flat portion 32a is welded to the joining flange portion of the cylindrical body portion 31 to be integrated with the cylindrical body portion 31, A bottom wall portion of the inner container 3 is formed. In the integrated state, the entire inner peripheral surface of the inner container 3 is coated with, for example, a fluororesin mixed with particulate earthen pot powder or ceramic powder.

The spherical portion 32b of the bottom plate 32 as described above is used as a surface for installing the water heater 5, and the water heater 5 is installed on the surface of the water heater.
(Configuration of water heater)
The water heater 5 is a sheet heater (band heater) having a predetermined thickness and a predetermined width printed on a spherical portion 32b of the bottom plate 32 through a predetermined insulating layer (insulating glass layer or the like) 51. For example, as shown in FIG. 3 and FIG. 9, a pair of power feeding portions (feeding power) that are located on the center side of the spherical portion 32 b and that are provided symmetrically with respect to the AA ′ axis (see FIG. 9). Power supply terminal portions) 52a and 52b as starting points (and end points), leaving only a partial fan-shaped portion (positioned on the front end side on the AA ′ axis) of the spherical portion 32b, and the entire spherical portion 32b. A pair of left and right axisymmetrical pairs (two sets) that are arranged as uniformly as possible in a continuous manner in a single stroke while bending as desired, never crossing each other, with a predetermined distance between them. Wing pattern (shape with butterfly spreading wings) It has become more. And the insulating layer 51 similar to the spherical part 32b side is printed also on the lower surface side (front surface side).

  The water heater 5 having a pair of symmetrical wing patterns is disposed symmetrically with respect to the left and right symmetry axis A-A ′ as shown in detail in FIG. , The fan-shaped heater non-installation surface (the portion where the water heater 5 and the insulating layer 51 are not provided) 32S is provided in the forward direction (the direction of the hot water outlet 7) from the center O of the spherical surface portion 32b. Yes. For example, as shown in FIGS. 5, 7, and 8, for example, as shown in FIGS. 5, 7, and 8, a substantially triangular shape is attached to the center O portion of the rear surface side (grip 8 side) spherical surface portion 32 b of the heater non-installation surface 32 </ b> S. The electrical component mounting bracket 10 is attached.

  The bracket main body 10a portion of the electrical component mounting bracket 10 is mounted with a predetermined space (gap) between the upper air spherical surface portion 32b by, for example, three legs 10b, 10c, and 10d. It is comprised so that it may not receive to the influence of the heat from the baseplate 32 which is.

  Further, the flat portion 32a of the bottom plate 32 has support metal fittings 12a and 12b for screwing and fixing the bottom member 1b to the bottom of the cylindrical case 1a, and a thermostat (one for safety) described later. A support fitting 12c for attaching the (shot thermo) 15 is provided. Each of the support fittings 12a to 12c is provided with a screw groove 13 for screwing a mounting screw, for example, as shown in FIG.

  For example, as shown in FIG. 9, the water heater 5 configured as described above is set in a state where the inner container 3 is incorporated into the container main body 1 at the center of the left-right symmetry axis A-A ′ ( In the state of FIG. 1, the container body 1 is obliquely inclined by a predetermined angle θ from the position of the straight line XX ′ in the front-rear direction connecting the front end side pouring outlet 7 and the rear end side handle 8 to the right in the bottom view. The left and right wing axis BB ′ which is provided in a rotated state and crosses the left and right wing portions of the pair of left and right symmetrical wing patterns is also the left and right center axis YY ′ (X− It is provided at a position rotated by the same predetermined rotation angle θ from the right (X ′ axis) to the right.

  Thereby, the fan-shaped heater non-installation portion 32S on the spherical surface portion 32b is, for example, as shown in FIG. 9, in a state in which the inner container 3 is incorporated in the container main body 1, in the bottom portion of the container main body 1. The sheet heater 5 is located in the XY 'region on the front side of the YY' axis that divides the front-rear direction portion in half. In the latter half of the Y-Y ′ axis that divides the front-rear direction portion of the bottom of 1 into ½, approximately 2/3 of the entire heater is disposed.

  As a result, in this embodiment, the heating capacity of the bottom of the inner container 3 is not uniform throughout, and the handle 8 side (rear side) is larger than the hot water outlet 7 side (front side), and the inner container 3 The hot water in the portion closer to the handle 8 side than the hot water pouring outlet 7 side starts to boil relatively quickly. Accordingly, correspondingly, as described later, the boiling detection steam introduction passage 44 on the lid 4 side is also provided near the rear end on the handle 8 side, thereby detecting boiling as quickly as possible, The kettle is completed without any futile steam.

In connection with the heater arrangement pattern, one of the bimetals 25A and 25B for detecting airing described below is located on the rear end side of the Y-Y 'axis. (See, for example, FIGS. 2 and 9).
(Configuration of electrical equipment)
For example, as shown in FIG. 4, the electrical component section 6 is provided with various electrical components installed on the electrical component base body, centering on an electrical component base body (housing for both substrates) made of a heat-resistant synthetic resin molding. For example, various electrical components such as a power supply terminal, a switch mechanism, and a flying detection unit are provided in the unit. In the case of this embodiment, for example, a disc-shaped bimetal is adopted as the emptying detection means.

  In the case of this embodiment, the electrical component base has, for example, the fan-shaped heater non-installation portion 32S, and is rotated A− to the right by a predetermined angle θ from the longitudinal axis XX ′ of the container body 1. Corresponding to the layout of the water heater 5 arranged in a pair of left and right wing structures symmetrical to the left and right via the A ′ axis, a pair of left and right wing structures (butterfly butterfly) also symmetrical to the left and right via the AA ′. Wing structure). Then, the base part for electrical equipment is attached to the bottom surface side central part of the spherical surface part 32 a of the bottom plate 32 through the electrical equipment fitting 10.

  First, reference numeral 21 denotes an overall cylindrical power receiving coupler including a guide cylinder 21a, a cylindrical electrode 21b, and a rod-shaped electrode 21c. Bimetal installation portions 23A and 23B are provided at the left and right front portions of the power receiving coupler 21 portion, and a power source is provided at the rear portion. Terminal installation portions 24A and 24B are provided by integral molding. The bimetal installation parts 23A and 23B are provided with disc-shaped bimetals 25A and 25B for detecting the emptying on the upper side, and the disc-like bimetals 25A and 25B correspond to the upper and lower sides. The provided first and second power contacts 19a, 20a, 19b, 20b are turned on and off.

  That is, the disc-shaped bimetals 25A and 25B are located on the upper side of the bimetal support portions 27a and 27b integrally molded with the opening frame portions of the bimetal installation portions 23A and 23B and are bent upward at a right angle. In the state pressed and biased upward by the spring members 26a and 26b, the elastic members are elastically supported so that they can be moved up and down in the vertical direction. The installation surface of the water heater 5 in the spherical surface portion 32b of the bottom plate 32 is brought into contact with a predetermined contact pressure.

  That is, the outer peripheral edge portions (heat-sensitive deformable portions) of the disc-shaped bimetals 25A and 25B are in contact with the entire peripheral edge portion in a skirt-like shape on the surface of the water heater 5 in a normal temperature state. However, when the temperature on the water heater 5 installation surface side becomes equal to or higher than a predetermined operation reference temperature (for example, 140 ° C.), the water heater 5 warps in the reverse direction (downward) and is inclined in the reverse direction.

  On the other hand, the disc-shaped bimetals 25A and 25B are provided on the lower surface side of the outer peripheral edge portion and located above the second power source contacts (movable side contacts) 20a and 20b so as to be elastically deformable in the vertical direction. A shaft member portion extending upward by a predetermined length at the tip of the second power source contact actuating member (lever piece) 18a, 18b is made to be able to abut (for example, portions 18a, 18b in FIGS. 4 and 5). See).

  When the outer peripheral edge portions (heat-sensitive deformation portions) of the disc-shaped bimetals 25A and 25B are in an operating state due to a temperature rise equal to or higher than the operation reference temperature (140 ° C.) of the water heater 5 installation surface portion, the outer peripheral edge side The shaft member part is pushed downward by reversing it downward, and the second power contact 20a, 20b is pushed downward by the lever operation of the power contact actuating members 18a, 18b. The tips 20c and 20d of the contacts 20a and 20b and the tip side contact portions 19c and 19d of the upper first power contact (fixed side contact) 19a and 19b are separated from each other, so that the power supply to the water heater 5 is performed. Stopped.

  This state is maintained until the outer peripheral edge portions (heat-sensitive deformation portions) of the disc-shaped bimetals 25A and 25B are restored to the original state.

  In the case of the configuration of this embodiment, for example, as shown in FIG. 3 and FIG. 9, a plurality of disc-shaped bimetals 25A and 25B that are less likely to cause coalescence due to local heating of the planar heater ( 2) Corresponding to the 5A and 5B sections where the planar heaters extending in a strip shape in a parallel state are bent apart from each other in the outer peripheral direction and a space without a sufficiently large planar heater is formed between them. In addition, in the portions 5A and 5B where the same disc-shaped bimetals 25A and 25B are to be provided, a plurality of (two) strip-shaped planar heaters extending in parallel are bent in the outer circumferential direction. By forming a space without any sufficiently large planar heaters between them, so that the corresponding planar heater portions are less likely to cause foam coalescence between adjacent planar heaters. By doing so, it is avoided that a large number of bubbles generated in each of the planar heater portions are united with each other, and by combining the bubbles, a partially large cavity portion is formed, and the cavity portion and the bottom surface of the inner container 3 are formed. The contact with water is cut off, local heating is generated, and a partial emptying state is prevented from occurring in the local heating generation part. The disc-shaped bimetals 25A and 25B for detecting the emptying are erroneous. It prevents operation and false detection.

  Further, in this case, a temperature detection region (a region indicated by a two-dot chain line in FIGS. 3 and 9) corresponding to the outer peripheral edge portion (heat-sensitive deformation portion) which is at least the circular sensing surface of the disc-shaped bimetals 25A and 25B. The width of the sheet heater in () is a portion formed by coalescence of bubbles by reducing the amount of bubbles generated in the sheet heater portion, such as printing with a width smaller than a predetermined dimension than in other regions. A configuration that does not cause general emptying is employed (described later).

  On the other hand, as shown in FIG. 4, for example, as shown in FIG. 4, the power supply terminals 24A and 24B of the electrical component base are supplied with power supplied via the cylindrical electrode 21b and the rod electrode 21c of the power receiving coupler 21. 5 for supplying power to the power supply terminals 52a and 52b of the elastic contact structure (provided at the upper end portion of the stud portions 22a and 22b in FIG. 4) and the handle 8 side power switch section 47 described later. Various connection terminals such as a terminal T1, a connection terminal T2 to the one end side connection terminal 16b of the thermostat 15 and a signal line connection terminal T3 to the handle 8 side boiling detection unit 46 to be described later are provided. Are connected via lead wires.

  The power supply terminal T1 to the handle 8 side power switch section 47 is connected to the operation power switch 47 on the upper end side of the handle 8 via a wiring space 8a in the handle 8 shown in FIG. Are connected in series with the boiling detection bimetal switching contact 46a of the boiling detection unit 46, and the wiring in the handle 8 is again connected from the boiling detection bimetal switching contact 46a through the lead wire as the power supply wiring. The inside of the space 8a is turned up and connected to the other end side connection terminal 16a portion of the safety thermostat 15.

The safety thermostat 15 is provided, for example, corresponding to the planar heater portion on the left side of the fan-shaped heater non-installation surface 32S of the spherical surface portion 32b, and this portion has a special abnormal temperature (for example, a high temperature of 270 ° C. or higher). The operation is stopped at this time, and the supply of all power to the water heater 5 and others is stopped. As shown in FIGS. 3 and 6, for example, the safety thermostat 15 is attached to a thermostat support fitting 12c of the flat portion 32a of the bottom plate 32, and a coil spring for pressing and urging in a support case 15a extending in the vertical direction. The thermal sensor 15b is accommodated through 15c, the tip of the thermal sensor 15b is brought into contact with the planar heater portion on the left side of the fan-shaped heater non-installation surface 32S in a pressed state, and the mounting bracket portion 15d provided on the outer peripheral side is interposed. And is fixed to the support fitting 12c.
(Configuration of power supply stand)
Further, in FIG. 1, reference numeral 2 denotes a table-type power supply stand, and at the center thereof is a power supply coupler 11 having the same cylindrical structure that is fitted into the guide cylinder 21 a of the power receiving coupler 21 having the cylindrical structure. While projecting upward at a predetermined height, a power cord storage space is provided on the back side.

  The power feeding coupler 11 corresponds to the guide cylinder 21a of the power receiving coupler 21, and is provided inside the guide cylinder 11a so as to be slidable, and on the inner peripheral side of the guide cylinder 11a. The cylindrical electrode 11b is fitted inside the brush 21b with a brush structure electrode, and the rod-shaped electrode 21c on the power receiving coupler 21 side is inserted into the cylindrical electrode 11b. When a power cord (not shown) in the power cord storage space is connected to an AC power source, the AC power is supplied to the power receiving coupler 21 on the container body 1 side via the power base 2 side power feeding coupler 11, and the power receiving is further performed. Power is supplied to each power supply circuit described above via the coupler 21.

As a result, power is supplied to the water heater 5, the bimetals 25 </ b> A and 25 </ b> B for detecting hot water, the safety thermostat 15, the power switch unit 47, the boiling detection unit 46, and the like through the power supply circuit. In addition, a neon lamp 47a for illumination is provided in the power switch unit 47.
(Configuration of the lid part)
The lid 4 includes, for example, a synthetic resin upper plate 41, a synthetic resin lower plate 42 whose outer peripheral edge is coupled to the upper plate 41, and a metal inner cover 43 on the lower side thereof. And is detachably fitted in the vertical direction to the opening inside the shoulder member 1c. The space between the upper plate 41 and the lower plate 42 is formed in a heat insulating structure filled with a heat insulating material as necessary, and a part of the lower plate 42 is used for detecting boiling from below to above. A steam introduction passage 44 is provided.

  The steam introduction passage 44 is provided at a position near the rear end side handle 8 of the inner cover 43, and the boiling detection bimetal provided from the lower end side steam introduction port portion to the upper end side front portion of the handle portion 8. It communicates towards the steam passage for boiling detection which has 46a. Then, boiling is detected by the action of the bimetal 46a in the boiling detection steam passage portion.

  Then, when boiling of hot water in the inner container 3 is detected, supply of power to the hot water heater 5 is cut off at the bimetal 46a.

  In this case, in the configuration of this embodiment, the heating capacity of the bottom of the inner container 3 is not uniform as described above, and the grip 8 side (rear side) is more than the hot water pouring outlet 7 side (front side). Therefore, the hot water in the inner container 3 starts to boil relatively quickly in the portion closer to the handle 8 side than the hot water outlet 7 side. Accordingly, in response to this, the boiling detection steam introduction passage 44 on the lid 4 side is also provided near the rear end on the handle 8 side as described above, thereby allowing boiling steam to flow as quickly as possible. Introducing, detecting, and completing the water heating without any wasteful steam.

Further, a hot water supply passage 9 extending from the hot water inlet port of the lower side inner cover 43 to the hot water outlet port portion of the upper front side is provided on the front end side of the lid body 4. In the middle of the hot water supply passage 9, an open / close valve mechanism is provided for controlling the hot water supply state with the lock / unlock operation button 45. Reference numeral 45a denotes an opening / closing valve of the opening / closing mechanism, and 45b denotes a coil spring that urges the opening / closing valve 45a and the operation button 45 upward (closed state).
(Countermeasures for false detection of bi-metal for air detection)
By the way, as described above, when the above-described planar heater structure is employed as the water heater 5 for heating the inner container 3, the heater portion has high heating efficiency and can perform extremely quick water heating. Only the portion corresponding to the heater portion 3 is locally heated, and a number of bubbles are locally generated in the portion corresponding to the heater portion on the inner surface of the inner container 3. And this many bubbles are united before long and becomes a big bubble. In this case, when a plurality of planar heaters are adjacent to each other, bubbles generated adjacent to each other are combined to form a larger bubble.

  And when such a big bubble arises, the said bubble part will become a cavity, the contact with the inner container 3 and water will be interrupted by the said cavity, and the baseplate 32 part of the inner container 3 corresponding to the said heater part will be local. Is heated to a partial empty state, and the temperature of the part rises abnormally.

  As a result, the disc-shaped bimetals 25 </ b> A and 25 </ b> B for detecting the emptying provided corresponding to the heater section malfunction, and the power to the water heater 5 is shut off. Further, the planar heater is deformed. Further, the fluororesin on the inner peripheral surface of the inner container 3 is adversely affected (discoloration and water repellency reduction).

Therefore, in this embodiment, as described above, the disc-shaped bimetals 25A and 25B (temperature sensing surfaces thereof) for detecting the emptying are portions where foam coalescence due to local heating of the planar heater is less likely to occur, For example, as shown in FIGS. 3 and 9, a plurality (two) of strip-shaped planar heaters that are adjacent and extend in parallel with each other are bent and spaced apart from each other in the outer circumferential direction. A space that does not have a sufficiently large planar heater is formed, and is provided corresponding to the arrangement pattern portions 5A and 5B that are unlikely to cause coalescence of the generated bubbles. In the temperature detection regions 5A and 5B to be installed, a plurality of (two) strip-like planar heaters extending in parallel with each other are separated from each other by bending in the outer circumferential direction. Tens between each other By forming a space without a large planar heater, the corresponding planar heater part has a structure that is less likely to cause coalescence of bubbles due to local heating. It avoids as much as possible, and prevents malfunctioning and erroneous detection of the bimetal 25A, 25B for air-spreading detection.
(Detection structure of partial emptying state with hot water pouring)
The partial emptying state at the bottom of the inner container 3 is generated not only by the coalescence of bubbles at the time of boiling water as described above but also at the time of pouring hot water as in the following case, for example.

  That is, while the container main body 1 is connected to the power supply stand 2 and the hot water is being boiled, the container main body 1 is separated from the power supply stand 2 and tilted into a horizontal state so that the hot water is poured out. Then, the upper half side portion of the bottom portion of the inner container 3 where the planar heater is provided usually does not come into contact with hot water, and even if no power is supplied, the conventional planar heater is highly efficient. Due to heat generation, a considerable temperature rise overshoot occurs. When the temperature becomes equal to or higher than the air detection temperature, a substantially empty state is obtained.

  However, as already mentioned, in the conventional configuration, the emptying detection means for detecting emptying is provided at the center of the bottom of the inner container 3 or at the outlet side, and even when pouring hot water 3 corresponds to the portion in contact with the hot water in 3, so that it was not possible to detect the emptying state of the portion of the inner container 3 not in contact with such hot water.

  Therefore, when the pouring of hot water is finished and the container body 1 is returned to the power supply stand 2 again, since the hot water was being boiled, the supply of power to the planar heater is continued as it is until it reaches a boiling state. Heating of the hot water in the inner container 3 is continued.

  In this case, if the remaining amount of hot water is large, it may be left as it is. However, if the remaining amount of hot water is small and the state is close to emptying, the bottom portion that was not in contact with the hot water becomes the above high temperature. In the partially empty state, high-temperature heating by the planar heater starts, and a large heat load is applied to deform the bottom plate 32 portion, which is the planar heater installation surface, and the applied fluororesin Causes damage (burning, burning, reduced water repellency, discoloration, mineral adhesion, deterioration of foam loss, etc.).

  Accordingly, in the embodiment of the present invention, as shown in FIG. 9, one of the disc-shaped bimetals 25A, 25B for detecting the emptying is used as hot water at the time of pouring hot water at the bottom of the inner container 3. The container main body 1 is provided on the rear side of the left and right Y-Y 'axes that divides the bottom part of the inner container 3, for example, the front and rear direction (XX' axis direction) 1/2. However, the above-described partial emptying state of the bottom of the inner container 3 at the time of pouring hot water separated from the power supply stand 2 can be detected.

  According to such a configuration, the heating efficiency of the inner container 3 containing water is greatly improved by adopting the water heater 5 made of a planar heater, and the water boiling time is greatly shortened.

  In addition, the disc-shaped bimetal 25B for detecting emptying is provided in correspondence with the handle 8 side portion that does not come into contact with hot water at the time of pouring hot water at the bottom of the inner container 3, so that the container body 1 is A partial emptying state such as the upper side region of the bottom of the inner container 3 when pouring hot water separated from the power supply stand 2 is also reliably detected, and in the hot water pouring state, the power supply circuit to the planar heater Shut off.

  Therefore, after that, even if the container body 1 is returned to the power supply stand 2 side, the surface heater is heated until the temperature of the bottom of the inner container 3 decreases and the disc-shaped bimetal 25B is reset. There is no problem as in the past.

  Further, in the configuration of the embodiment of the present invention, as already described in the configuration of FIG. 9, the heating capacity of the bottom of the inner container 3 is uniform throughout by changing the arrangement amount of the planar heater per unit area. Instead, the handle 8 side (rear side) is configured to be larger than the hot water outlet 7 side (front side), and the hot water in the inner container 3 is also the same as the hot water outlet 7 side. The hot water in the portion close to the handle 8 side starts to boil relatively quickly.

  Accordingly, in response to this, the boiling detection steam introduction passage 44 on the lid 4 side is also provided near the rear end on the handle 8 side as described above, thereby allowing boiling steam to flow as quickly as possible. Introduced and detected, the heater is completed as soon as possible without shutting off any steam, and the power is shut off.

  As a result, it is possible to realize a rapid water heating, a power shutdown in a short time, a possible power saving, a high steam-less function, and the like.

  Further, since the total amount of steam generated thereby is greatly reduced, deterioration of synthetic resin parts and the like are also reduced.

As a result, according to the embodiment of the present invention, according to the specific amount of hot water in the inner container 3, the partial emptying state that occurs in the bottom portion of the inner container 3 when pouring hot water is ensured, In addition, since the container body 1 can be returned to the power supply stand 2 with the power supply circuit turned off in advance, the problem of performing unnecessary heating until the actual emptying as in the past is solved. As a result, a more reliable and durable electric water heater can be provided.
(Modification)
In the configuration of the above embodiment, the disc-shaped bimetals 25A and 25B are employed as the emptying detection means at the bottom of the inner container 3. However, the emptying detection means can be changed to, for example, a thermistor. .

  The emptying detection means at the bottom of the inner container 3 in the configuration of the above embodiment is not necessarily limited to the disk-like bimetals 25A and 25B as described above, and employs temperature detection means with high responsiveness such as a thermistor, for example. You can also.

  In this way, when the thermistor is used as the air blow detection means, the detection means itself can be configured with a small size, and the temperature detection performance and responsiveness can be made high. It becomes possible to install it arbitrarily in a narrow area between planar heaters that are difficult to generate, or in a desired site where foam coalescence is not likely to occur due to local heating of the planar heater, and local heating occurs in the planar heater part. However, it is possible to detect the bottom plate temperature quickly and accurately without being affected by the coalescence of bubbles due to the local heating.

  As a result, it is possible not only to reliably prevent malfunctions and false airing detection, but also because it is not always necessary to narrow the width of the planar heaters or widen the arrangement interval, so that the heating efficiency is extremely high. Can be.

  1 is a container main body, 2 is a power supply stand, 3 is an inner container, 3a is a flange part, 4 is a lid body, 5 is a water heater, 6 is an electrical equipment part, 7 is a hot water outlet (lower opening part), 8 is a handle, 10 is an electrical component mounting bracket, 11 is a power supply coupler, 15 is a safety thermostat, 18a and 18b are power contact actuating members, 19a and 19b are first power contacts (fixed side contacts), and 20a and 20b are second power supplies. Contacts (movable contacts), 21 is a power receiving coupler, 23A and 23B are bimetal installation parts, 24A and 24B are power supply terminal installation parts, 25A and 25B are disk-shaped bimetals, 26a and 26b are spring members, and 27a and 27b are bimetal supports. , 32 is a bottom plate, and 32b is a spherical surface portion.

Claims (3)

A container body that houses and supports the inner container, has a power receiving portion on the bottom side, a handle provided at the rear of the container body, and a lid that closes the upper opening of the inner container at the top of the container body When provided with the hot water spout portion provided on the upper end side front portion of the container body, and Heater for boiler provided at the bottom of the inner container, in correspondence with the Heater of the inner container bottom a dry frying detecting means is connected to the power receiving unit and any of the container body, the electric comprising a power base having a feeding unit for supplying power to the upper Kihi over data or the like via the same power receiving portion In the water heater, the emptying detection means is provided corresponding to a portion that does not come into contact with hot water when pouring hot water at the bottom of the inner container, and the inner container at the time of hot water pouring is separated from the power supply stand. together to be able to detect partial boil-dry state of the bottom Electric kettle to heat generation amount by the heater, in the part and the hot water spout not contact with water during the portion in contact with the hot water at the time of exiting hot Note, characterized in that as the mutually different heat value. A container body that houses and supports the inner container, has a power receiving portion on the bottom side, a handle provided at the rear of the container body, and a lid that closes the upper opening of the inner container at the top of the container body When provided with the hot water spout portion provided on the upper end side front portion of the container body, and Heater for boiler provided at the bottom of the inner container, in correspondence with the Heater of the inner container bottom a dry frying detecting means is connected to the power receiving unit and any of the container body, the electric comprising a power base having a feeding unit for supplying power to the upper Kihi over data or the like via the same power receiving portion In the water heater, the emptying detection means is provided corresponding to a portion that does not come into contact with hot water when pouring hot water at the bottom of the inner container, and the inner container at the time of hot water pouring is separated from the power supply stand. together to be able to detect partial boil-dry state of the bottom The amount of heat generated by the heater, hot Note than the heating value of the portion in contact with the hot water at the time of output, electrical, characterized in that towards the heating value of the hot water will not contact the portion at the time of exiting water Note is larger Water heater. Portion in contact with water during the hot water extraction is water extraction port side of the container body, according to claim 1 or 2 parts no longer in contact with water during the hot water extraction, characterized in that a grip portion of the container body The electric water heater described.

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