JP2005261756A - Electric pot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric pot unfailingly prevented from bumping. <P>SOLUTION: A chamfered portion 48 inclined outwardly downward is provided on the outer peripheral part of upper surface of a heater plate 44 in an electric pot for boiling a liquid in a container 10 by providing the heater plate 44 equipped with a heating means (heater 46) on the upper part of a pot body 30 and a liquid container 10 detachably attached onto the upper surface of the heater plate 44. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric pot such as a milk preparation pot that is heated and kept at a predetermined temperature.

  As shown in FIG. 8, this type of electric pot is provided with a disposition recess 3 in which the liquid container 2 is detachably disposed at the top of the pot body 1, and the heat shield container 4 and the heating container are disposed in the disposition recess 3. A heating plate 6 provided with means 5 is arranged. Further, in this electric pot, a temperature detecting means for detecting the liquid temperature in the liquid container 2 is arranged at the center of the arrangement recess 3. And the control means which controls the said heating means 5 heats the liquid (water) in this liquid container 2 to the milk preparation temperature by controlling the said heating means 5 based on the detected value of the said temperature detection means. The temperature is kept at a predetermined temperature after boiling or boiling.

  The liquid container 2 is made of glass, and its bottom is designed to be a flat surface. However, the liquid container 2 is often produced in a state of being slightly raised in an arc shape due to a large amount of forming error. On the other hand, an aluminum die cast heater is used as the heating plate 6 provided with the heating means 5, and the upper surface on which the liquid container 2 is placed is manufactured as a flat surface as designed. For this reason, the portion that contacts the heating plate 6 is not constant for each liquid container, and in many cases, the lower end of the curved portion in the outer peripheral portion of the liquid container 2 contacts in an annular shape. As a result, in the liquid container 2, the contact portion A through which heat is directly transmitted becomes a heating source, and convection as shown in the figure is generated starting from the outer peripheral portion.

  However, the convection is located on the outer peripheral portion of the liquid container 2, and a staying portion that is not mixed by convection is generated in the central portion of the liquid container 2. In addition, the liquid in the liquid container generates downward convection when the vicinity of the outer periphery is cooled by outside air, and this downward convection collides with the upward convection due to heating, so that the stirring action by convection is exerted. It is decreasing. As a result, the temperature in the vicinity of the contact portion A is directly increased to a high temperature by heating by the heating means 5, but the temperature in the central portion is increased only by heat conduction, and thus the temperature difference is increased in the region in the liquid container 2. For this reason, the temperature is raised to near the boiling point in the vicinity of the contact portion A which is a heating source, while the boiling point is not yet reached in other portions, particularly the central portion where the temperature detecting means is disposed. In the vicinity of, large bubbles are generated due to excessive heating, which is considered to cause bumping. When this bumping is severe, about 2 m may be discharged from the spout formed in the liquid container 2.

  In such an electric pot, prior art document information for preventing bumping includes the following.

Japanese Patent No. 2715925 JP-A-8-317862

  In the electric pot described in Patent Document 1, when the temperature reaches a predetermined temperature range before boiling, the heating is temporarily weakened or stopped, and after the temperature detected by the temperature detecting means falls below the predetermined temperature, normal heating is performed again. Is configured to do.

  In the electric pot for milk preparation described in Patent Document 2, the temperature rising characteristic of water is obtained from the change in the detected temperature in the first set temperature range before boiling, and the temperature in the vicinity of boiling estimated by the temperature rising characteristic is obtained. The second heating condition is set according to the estimated temperature rise characteristic. In addition, the second heating condition is set when the second set temperature range higher than the first set temperature range is reached, and the heating is performed based on these heating conditions.

  However, since the electric pot does not take into account the liquid temperature difference in the liquid container, there is a high possibility of partial overheating in the liquid container, and the bumping phenomenon cannot be reliably prevented.

  Therefore, an object of the present invention is to provide an electric pot that can reliably prevent a bumping phenomenon.

  In order to solve the above problems, the electric pot of the present invention has a heating plate provided with heating means at the top of the pot body, and a liquid container is detachably provided at the top of the heating plate. In the electric pot for boiling the liquid in the liquid container, a chamfered portion that is inclined outward and downward is provided on the outer peripheral portion of the upper surface of the heating plate.

  In this electric pot, the control means for controlling the heating means controls the heating means based on the detected value of the temperature detecting means for detecting the liquid temperature in the liquid container, and the heating control is performed before boiling. It is preferable to provide a waiting time for temporarily stopping heating by the heating means and averaging the liquid temperature in the liquid container.

  In this case, it is preferable that the control means sets the heating time after the standby time based on the determination rank in the capacity determination performed before boiling.

  In addition, the liquid container includes a spout that is recessed downward in a part of the upper end opening thereof, and includes a lid that externally fits and closes the upper end opening, and the corresponding portion of the lid with the spout It is preferable that a notch is provided in the inner wall and an inner wall that is located at a predetermined interval and extends to at least the lower end of the inlet is provided inside the inlet.

  In the electric pot of the present invention, since the chamfered portion is provided on the outer peripheral portion of the heating plate for heating the liquid container, the contact portion between the heating plate and the liquid container is used as the ridge portion of the chamfered portion, Can be positioned on the axial center side. Therefore, the convection generated by heating the liquid in the liquid container can approach the axis. In addition, the liquid in the liquid container generates a downward convection when the vicinity of the outer periphery is cooled by the outside air, and this downward convection can be prevented from colliding with an upward convection caused by heating. Acts to promote convection. As a result, the liquid around the axis can be stirred by convection, the liquid temperature difference in the liquid container can be made uniform, and the bumping phenomenon caused by partial overheating can be suppressed.

  Further, the control means for controlling the heating means has a waiting time for temporarily stopping the heating by the heating means before boiling and averaging the liquid temperature in the liquid container. The liquid temperature can be averaged and the bumping phenomenon can be further suppressed.

  Furthermore, since a notch is provided in a portion of the lid corresponding to the spout of the liquid container, and an inner wall that is located at a predetermined interval and extends to at least the lower end of the spout is provided inside the spout, the inner wall The inside of the spout can be covered. Therefore, even if the convection generated in the liquid container is biased and a bumping phenomenon occurs, it is possible to prevent high-temperature liquid from being discharged from the spout.

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

  1 and 2 show a milking pot that is an electric pot according to an embodiment of the present invention. In this milk preparation pot, the liquid container 10 is detachably arranged with respect to the pot body 30, and the liquid (water) in the liquid container 10 is heated to a predetermined temperature and then kept warm or boiled to a predetermined temperature. To keep warm.

  Specifically, the liquid container 10 is made of heat-resistant glass having a cylindrical shape with an upper end opening. A part of the upper edge of the liquid container 10 is provided with a spout 11 that is recessed downward and slightly outward. A handle member 12 is attached via a metal ring member 13 so as to be located on the opposite side of the spout 11.

  The upper end opening of the liquid container 10 is closed so as to be openable and closable by a separate lid body 14. As shown in FIGS. 3 (A), 3 (B) and 4, the lid 14 is fitted to the outer peripheral edge of the upper end opening of the liquid container 10, and is notched at a portion corresponding to the spout 11. A portion 15 is provided, and a flange portion 16 protrudes above the cutout portion 15. In addition, an air inlet 17 is provided on the side opposite to the notch 15, and a finger guide 18 extending toward the upper end of the handle member 12 is provided on the upper portion thereof. Furthermore, the lid body 14 of the present embodiment is provided with an inner wall 19 that is located on the inner side with a predetermined interval from the outer peripheral portion of the container body and extends further downward beyond the lower end of the spout 11. The inner wall 19 is provided with a plurality of slits 20 with a predetermined interval, and a rib 21 that presses against the inner wall 19 of the liquid container 10 is projected. Further, a cutout portion 22 cut out toward the spout 11 is provided at a portion corresponding to the spout 11. In a state where the lid 14 is attached to the liquid container 10, the upper end of the notch 22 is located below the spout 11.

  As described above, the lid body 14 of the present embodiment is provided with the inner wall 19 that is located at a predetermined interval inside the spout 11 of the liquid container 10 and extends to the lower end of the spout 11. The inside of the mouth 11 can be covered. Therefore, even if the convection generated in the liquid container 10 is biased and a bumping phenomenon occurs, it is possible to prevent the high temperature liquid from being discharged from the spout 11.

  As shown in FIGS. 1 and 2, the pot body 30 is provided with an arrangement recess 33 for the liquid container 10 in an exterior body composed of an upper exterior body 31 and a lower exterior body 36. A heat shield container and a heating plate 44 are disposed. The pot body 30 is provided with container detection means for detecting whether or not the liquid container 10 is arranged in the arrangement recess 33 and temperature detection means for detecting the liquid temperature in the liquid container 10. ing.

  The upper exterior body 31 is made of a resin having a lower end opening that has a substantially oval shape in plan view. The upper exterior body 31 is provided with an operation panel portion 32 on the front side, and an arrangement concave portion 33 for the liquid container 10 is formed on the rear side in a cylindrically protruding wall. At the bottom of the arrangement recess 33, there are provided a wiring insertion hole 34 for a heating means arranged on the heating plate 44 and an operation member insertion hole 35 for inserting a container detection means incorporating a temperature detection means. The lower exterior body 36 closes the lower end opening of the upper exterior body 31. The exterior body made up of the upper exterior body 31 and the lower exterior body 36 has an operation board 54 and a control board 65 by a partition wall 37 provided between the arrangement recess 33 of the upper exterior body 31 and the bottom of the lower exterior body 36. Are partitioned into a substrate housing portion 38 for disposing a substrate and a non-substrate housing portion 39 having a drainage path. In the present embodiment, the partition wall 37 includes a wall portion 70 provided on a substrate holder 68 for disposing a control substrate 65 described later, and a rib portion 40 protruding from the bottom of the lower exterior body 36. It is composed.

  The heat shielding container 41 is made of a galvalume steel plate in which a heat plate 44 (to be described later) is disposed. The heat shield container 41 may be made of stainless steel. On the bottom of the heat shield container 41, a wiring insertion hole 42 corresponding to the wiring insertion hole 34 and an operation member insertion hole 43 corresponding to the operation member insertion hole 35 are provided.

  The heating plate 44 is made of an aluminum die-cast heater with a heater 46 as a heating means. The heating plate 44 is disposed in the heat shield container 41, and the liquid container 10 is disposed on the upper portion thereof. The liquid inside is heated. An operation member insertion hole 45 corresponding to the operation member insertion holes 35 and 43 is provided at the center of the heating plate 44. The charging portion 47 of the heater 46 is disposed in the non-board housing portion 39 of the exterior body through the wiring insertion holes 34 and 42. A chamfered portion 48 that is inclined outward and downward is provided on the outer peripheral portion of the upper surface of the heating plate 44.

  Thus, in the milking pot of this embodiment, since the chamfered part 48 is provided in the outer peripheral part of the heating plate 44 which heats the liquid container 10, the contact part of this heating plate 44 and the liquid container 10 is a surface. It becomes a ridge part of the taking part 48. Therefore, the contact portion A can be positioned on the axial center side with respect to the liquid container 10 as compared with the conventional milk preparation pot. Further, the liquid in the liquid container 10 generates downward convection when the vicinity of the outer peripheral portion is cooled by outside air, and this downward convection can be prevented from colliding with upward convection due to heating. It can act to promote overall convection. Thereby, the convection produced by heating the liquid in the liquid container 10 can be brought closer to the axis. As a result, the liquid around the axis can be stirred by convection, the liquid temperature difference in the liquid container 10 can be made uniform, and the bumping phenomenon caused by partial overheating can be suppressed.

  As shown in FIG. 5, the chamfered portion 48 preferably has a radial dimension L1 of 12 mm to 17 mm, and a height dimension L2 of 0.5 mm to 1.5 mm. Here, when the dimension L1 is less than 12 mm, the portion that comes into contact with the liquid container 10 is close to the outer peripheral portion, and the portion near the axial center in the liquid container 10 is retained as in the conventional case. As a result, the liquid temperature is biased. Further, when the dimension L1 is larger than 17 mm, it is too far from the heater 46, so that the boiling time is delayed. Furthermore, when the dimension L2 is less than 0.5 mm, the manufacturing error of the liquid container 10 cannot be absorbed, and the lower end of the curved portion of the liquid container 10 comes into contact as in the conventional case. Furthermore, when the dimension L2 is larger than 1.5, the thickness of the heating plate 44 itself is increased. In the present embodiment, the chamfered portion 48 is formed so that the radial dimension L1 is 15 mm and the height dimension L2 is 1 mm in the heating plate 44 having a diameter of 120 mm and an end wall thickness of 7 mm. Forming.

  Container detecting means for detecting whether or not the liquid container 10 is disposed in the arrangement recess 33, that is, the presence or absence of the liquid container 10, is provided in the heat shield container 41 as shown in FIGS. A fixing member 49 for fixing, an operating member 51 urged upward by a spring 50 with respect to the fixing member 49, a link member 52 disposed below the operating member 51, and a control board to be described later And a sensor disposed at 65. The operating member 51 has an upper end that penetrates the heating plate 44 and protrudes into the arrangement recess 33, and detects the temperature of the liquid inside by detecting the temperature of the liquid container 10. A temperature sensor 53 that is a temperature detecting means is provided. The link member 52 is made of a magnetic metal material such as SUS430, and the liquid container 10 is disposed in the disposition recess 33, and the operation member 51 is immersed. The distal end is configured to extend to the vicinity of the wall portion 70 constituting the partition wall 37. Then, the leading end of the link member 52 enters or retracts between the magnetic sensor 66 disposed in the substrate housing portion 38 and the magnet disposed in the non-substrate housing portion 39, so that the magnetic sensor 66 is not moved. It is configured so that the vertical movement of the link member 55 can be detected by inputting or blocking magnetism.

  The operation board 54 is fixed to the back part of the operation panel part 32 in the board accommodating part 38 partitioned by the partition wall 37 by screws. On the operation board 54, as an input means operated by the user, a temperature setting switch 56 corresponding to the operation unit 55a shown in FIG. 6, a boiling switch 57 corresponding to the operation unit 55b, and a melody sound corresponding to the operation unit 55c. An on / off switch 58 is mounted. Further, the first LEDs 60a and 60b indicating the setting state of the heat retention temperature corresponding to the first display portions 59a and 59b shown in FIG. 6, the second LED 62 indicating whether or not the boiling control corresponding to the second display portion 61 is being executed, And the 3rd LED64 which shows the ON setting state of the melody sound corresponding to the 3rd display part 63 is mounted.

  The control board 65 is cable-connected to the temperature sensor 53 and the operation board 54, and is mounted with a magnetic sensor 66 for detecting the vertical movement of the link member 52 and a microcomputer 67 as control means. The microcomputer 67 performs predetermined heating control and heat retention control set in advance based on the operation of the switches 56 to 58 as input means provided on the operation board 54.

  Specifically, when the power cord is connected to a commercial power source, the microcomputer 67 sets the melody sound to ON at a temperature of 50 ° C. Then, when the liquid container 10 is disposed in the arrangement recess 33, the operation member 51 and the link member 52 constituting the container detection means are lowered, and the state is detected by the magnetic sensor 66, the first LED 60a and the third LED 64 are turned on, After the liquid in the liquid container 10 is heated to 50 ° C., the temperature is kept so as to maintain the temperature. In addition, when the switches 56 to 58 are operated in this state, the functions corresponding to the switches 56 to 58 are changed. That is, every time the temperature setting switch 56 is operated, the setting is changed from “95” → “50” → “95”. Further, when the boiling switch 57 is operated, the liquid in the liquid container 10 is boiled and then kept warm so as to maintain the set warming temperature. Further, when the on / off switch 58 is operated, the setting is changed from “off” to “on” to “off” each time the operation is performed. Furthermore, when the liquid container 10 is removed from the arrangement recess 33 with the power cord connected to the commercial power supply, the setting state at that time is stored, and then the liquid container 10 is arranged in the arrangement recess 33. Then, heating and heat insulation control are performed with the stored settings. In addition, when it is judged that it is idling at the time of a heating, while said 1st LED60a, 60b is blinked alternately, 3rd LED64 is blinked.

  The control substrate 65 is disposed in a substrate accommodating portion 38 partitioned by a partition wall 37 via a substrate holder 68. In this embodiment, the substrate holder 68 is integrally provided with a wall portion 70 constituting the partition wall 37. Specifically, the substrate holder 68 has a holder main body 69 for fixing the control substrate 65 by screwing to the lower portion, and extends so as to protrude downward and on both sides from one end of the holder main body 69, and the lower end edge of the holder main body 69 is The wall portion 70 is formed so as to coincide with the rib portion 40.

  Next, the heating control process in the case where the liquid in the liquid container 10 is boiled in the milk preparation pot will be described.

  First, the boiling switch is stored in a state in which a user stores a desired amount of water in the liquid container 10 and the liquid container 10 is disposed in the disposition recess 33, or in a state where 50 ° C. heat retention or 95 ° C. heat retention control is executed. When 57 is operated, the microcomputer 67 executes a heating control process.

  In this heating control process, as shown in FIG. 7, first, in step S1, the temperature maintaining temperature setting is read, and in step S2, the corresponding first temperature LED 60a or first LED 60b, which is the temperature maintaining temperature display, blinks, and in step S3. Then, the second LED 62 which is a boiling control display is turned on.

  In step S4, the temperature sensor 53 detects whether the liquid temperature in the liquid container 10 is 95 ° C. or higher. If the liquid temperature is 95 ° C. or higher, step S5 to step S16, which will be described later, are skipped and the process proceeds to step S17. On the other hand, if the liquid temperature is less than 95 ° C., the process proceeds to step S5.

  In step S5, the temperature sensor 53 detects whether or not the liquid temperature whose capacity cannot be determined is 85 ° C. or higher. When the liquid temperature is 85 ° C. or higher, the process waits until the liquid temperature is lower than 85 ° C., and when the liquid temperature is lower than 85 ° C., the process proceeds to step S6.

  In step S6, the heater 46 is turned on at full power, and then in step S7, the volume of the liquid in the liquid container 10 is determined. Here, this capacity determination is performed based on the time required to raise the temperature from the preset first set temperature to the second set temperature. Specifically, in the liquid container 10 capable of accommodating 1 liter, when the time required for temperature increase is 280 seconds or more, it is determined as the first rank of 800 ml or more, and the time required for temperature increase is 160. If it is longer than 2 seconds and shorter than 280 seconds, it is determined as the second rank that is 500 ml or more. If the time required for temperature increase is longer than 60 seconds and not longer than 160 seconds, it is determined as the third rank that is 200 ml or more. When the time required for the temperature rise is 60 seconds or less, it is determined that the engine is idle. Note that if it is determined that it is empty, interrupt stop processing is executed.

  When the volume determination is completed, a timer for measuring an elapsed time after the volume determination is completed, that is, after the liquid temperature reaches the second set temperature is started in step S8, and based on the volume determination in step S9. Wait until the set primary heating time elapses. Here, in this embodiment, the primary heating time is 5 minutes when the liquid capacity is determined as the first rank, 3 minutes when the liquid capacity is determined as the second rank, and 3 minutes when the liquid capacity is determined as the second rank. It is set to 0 minutes.

  When the primary heating time has elapsed, in step S10, the heater 46 is turned off, and in step S11, a timer is reset and started in order to measure the elapsed time after the end of primary heating. In step S12, the process waits until a preset standby time elapses. Here, in this embodiment, this waiting time is set to 1 minute regardless of the liquid volume. By this waiting time, averaging of the liquid temperature in the liquid container 10 is promoted.

  When the standby time has elapsed, in step S13, the heater 46 is turned on at full power, and in step S14, a timer is reset and started in order to measure the elapsed time after the end of the standby time. In step S15, the process waits until the secondary heating time set based on the capacity determination elapses. Here, in this embodiment, the secondary heating time is 4 minutes when the liquid capacity is determined as the first rank, 2 minutes when the liquid capacity is determined as the second rank, and 2 minutes when the liquid capacity is determined as the second rank. Is set to 0 minutes.

  When the secondary heating time has elapsed, in step S16, the measurement timer is reset, and then in step S17, it is detected whether the notification sound is set to OFF. If the notification sound is not set to OFF, the process proceeds to step S18, and a notification sound indicating that boiling has been completed is output, and the process proceeds to step S19. On the other hand, if the notification sound is set to OFF, the process directly proceeds to step S19.

  In step S19, after turning off the second LED 62 which is a boiling control display, the process proceeds to a heat retention control process based on the selected heat retention temperature. It should be noted that the first LED 60a or the first LED 60b, which is the heat insulation temperature display blinked in step S2, blinks when it is determined that the predetermined heat insulation temperature has been reached in the heat insulation control process.

  As described above, the milking pot according to the present embodiment has a waiting time for temporarily stopping the heating by the heater 46 before boiling, so that the liquid temperature in the heated liquid container 10 is averaged by heat conduction. In addition to the suppression of the bumping phenomenon by the chamfered portion 48 formed on the heating plate 44, it is possible to further suppress the bumping phenomenon.

  In addition, the electric pot of this invention is not limited to the structure of the said embodiment, A various change is possible.

It is sectional drawing which shows the milking pot which is an electric pot which concerns on embodiment of this invention. It is a disassembled perspective view which shows schematic structure of a milking pot. (A), (B) is a perspective view which shows the cover body of a liquid container. It is a front view which shows the mounting state body of a liquid container and a cover body. It is a principal part expanded sectional view of a heating plate. It is a front view which shows an operation panel part. It is a flowchart which shows the heating control process by a control means. It is sectional drawing which shows the heating state of the liquid container by the conventional electric pot.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Liquid container, 11 ... Spout, 14 ... Lid body, 15 ... Notch part, 19 ... Inner wall, 30 ... Pot main body, 31 ... Upper exterior body, 33 ... Disposition recessed part, 36 ... Lower exterior body, 41 ... Interception Heat container, 44 ... heating plate, 46 ... heater (heating means), 48 ... chamfered portion, 54 ... operation board, 65 ... control board.

Claims (4)

In the electric pot for boiling the liquid in the liquid container by disposing a heating plate provided with heating means on the top of the pot body and disposing the liquid container on the top of the heating plate in a removable manner.
An electric pot comprising a chamfered portion that is inclined outward and downward on an outer peripheral portion of the upper surface of the heating plate.   The control means for controlling the heating means controls the heating means based on the detection value of the temperature detecting means for detecting the liquid temperature in the liquid container, and the heating control is temporarily heated before boiling. The electric pot according to claim 1, further comprising a waiting time for stopping heating by the means and averaging the liquid temperature in the liquid container.   The electric pot according to claim 2, wherein the control means sets a heating time after the waiting time based on a determination rank in capacity determination performed before boiling.   The liquid container includes a spout that is recessed downward in a part of the upper end opening thereof, and includes a lid body that externally fits and closes the upper end opening, and is cut out at a portion corresponding to the spout in the lid body. The electric pot according to any one of claims 1 to 3, further comprising an inner wall provided at a predetermined interval and extending to at least a lower end of the spout while being provided with a portion. .

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