JP5053963B2 - Heating container - Google Patents

Description

  The present invention relates to a heating container for heating a liquid such as an electric pot or a humidifier.

  This type of heating container includes a container for storing a liquid inside an exterior body, and a heater is provided as a heating means at the bottom of the container to heat the liquid (water) through the container and boil. Then, the temperature is kept at a predetermined temperature. In the electric pot, heated hot water can be discharged by a pump, and in the humidifier, steam generated from the heated hot water can be supplied indoors. In addition, the electric pot is configured to execute a re-boiling process for boiling again the liquid being kept warm when a re-boiling switch provided on the operation panel is operated.

Prior art document information relating to such a heating container includes the following.
JP-A-8-131333

  Patent Document 1 describes an electric pot in which a first temperature sensor is disposed at the bottom of a container and a second temperature sensor is disposed at the upper portion of the outer surface of the container. A 1st temperature sensor outputs the temperature information at the time of performing a heat retention process to a control means. A 2nd temperature sensor outputs the temperature information at the time of performing a boiling process to a control means, and is arrange | positioned so that it may be located above a rated full water position.

  Since the electric pot of Patent Document 1 configured as described above heats the container with full power by the heater when the boiling process is performed, the periphery of the bottom of the container becomes high temperature. However, in this boiling process, the second temperature sensor located at the upper part of the container determines whether or not the liquid inside has boiled, so that it is possible to make a substantially accurate boiling determination without being affected by the heat of the heater. Can do.

  However, the electric pot disclosed in Patent Document 1 detects the steam temperature of hot water by disposing the second temperature sensor above the full water position. Further, the user does not always execute the boiling process at the full water level. The distance from the water surface to the second temperature sensor is long during the boiling process with a small amount, and the distance from the water surface to the second temperature sensor is short during the boiling process with the full amount. Therefore, the detection accuracy is biased depending on the amount of water. Nevertheless, in Patent Document 1, if a certain set value is not detected, it is not determined that the water has boiled. Therefore, excessive heating may be performed during a small amount of operation.

  This invention is made | formed in view of the conventional problem, and makes it a subject to provide the heating container which can perform an exact boiling determination irrespective of the amount of water.

In order to solve the above-described problems, a first heating container of the present invention includes a container for storing a liquid, a heating unit disposed at the bottom of the container, and a first temperature detection unit disposed at the bottom of the container. A second temperature detecting means disposed on the upper outer surface of the container, and a control means for performing a boiling process for heating the liquid by controlling the heating means based on the detected temperatures of the first and second temperature detecting means. In the boiling process by the control means, a first boiling determination step for setting a first boiling completion time when the detected temperature of the first temperature detecting means is equal to or higher than a preset bottom set value, and the second temperature And when detecting that the detected temperature of the first temperature detecting means is greater than or equal to a preset bottom reference value when detecting that the degree of increase in the detected temperature of the detecting means is greater than or equal to a preset judgment value , The detected temperature of the second temperature detecting means is After waiting until it detects a reference value or more, a second boiling determination step of setting a second boiling completion time, the parallel processing, in the second boiling determination step, the temperature detected by the first temperature detecting means bottom reference If it is equal to or greater than the value, heating by the heating means stops when the second boiling completion time elapses, and if the detected temperature of the first temperature detection means is less than the bottom reference value, the first boiling completion time elapses. Then, the heating by the heating means is stopped.

  Here, the “degree of increase in detected temperature” means a temperature difference between the maximum value and the minimum value of a plurality of (for example, 20) temperature information that is detected and stored every predetermined time. In addition, the determination based on the comparison between the degree of increase and the determination value may determine that the boiling has occurred by one detection, but it is preferable to determine that the boiling has occurred by continuously detecting two or more times. When determining boiling when continuously detected twice or more, for example, when the 20th temperature detection is performed, the first comparison determination is performed. After that, when the 21st temperature detection is performed, the first temperature information is discarded, and the comparison judgment is performed based on 20 pieces of temperature information from the 2nd time to the 21st time.

  The first heating container configured as described above includes the first boiling determination step by the first temperature detection means disposed at the bottom of the container and the second boiling by the second temperature detection means disposed at the upper part of the outer surface of the container. The determination process is processed in parallel. When the determination condition in the second boiling determination step is satisfied, the boiling process is stopped after the second boiling completion time set in the second boiling determination step elapses, and the determination condition in the second boiling determination step is If not established, the boiling process is stopped after the first boiling completion time set in the first boiling determination step. Therefore, even if an error occurs in the detected temperature due to the amount of water or the usage environment, it is possible to reliably stop the heating means in a boiling state and prevent overheating.

In addition, in the second boiling judgment step, when the detected temperature of the first temperature detecting means detects the base reference value or more, after waiting until the detected temperature of the second temperature detecting means detects the lateral reference value or more, Insufficient heating can be prevented because the second boiling completion time is set. In addition, when the second temperature detection unit is out of order, boiling detection can be performed only by the first temperature detection unit.

In the first boiling determination step, the first heating container preferably changes the setting of the first boiling completion time based on the temperature detected by the first temperature detecting means immediately after the boiling process is performed. This configuration is suitable for a re-boiling process that is performed subsequent to the heat retention process in an electric pot that is one of the heating containers. And if it does in this way, the overheating in a reboiling process can be prevented.

  Further, the second heating container of the present invention includes a container for storing a liquid, heating means disposed at the bottom of the container, first temperature detection means disposed at the bottom of the container, and an outside of the container. A second temperature detecting means disposed on the upper side of the side surface; and a control means for controlling the heating means based on the detected temperatures of the first and second temperature detecting means to perform a boiling process for heating the liquid, In the boiling process by the control means, a first boiling determination step for setting a first boiling completion time when the detected temperature of the first temperature detecting means is equal to or higher than a preset bottom set value, and a detected temperature of the second temperature detecting means. And a second boiling judgment step for setting a second boiling completion time when the value becomes equal to or greater than a preset lateral setting value, and when the boiling completion time with a short heating time elapses among these boiling judgment steps, the heating means Configuration to stop heating by It is.

  The second heating container performs the parallel processing of the first boiling judgment step by the first temperature detection means and the second boiling judgment step by the second temperature detection means, like the first heating container. Of these boiling determination steps, the boiling process is stopped after the boiling completion time set for a short heating time. Therefore, even if an error occurs in the detected temperature due to the amount of water or the usage environment, it is possible to obtain the same operation and effect that the heating means can be surely stopped in a boiling state to prevent overheating.

In the second heating container, the first boiling determination step has a first bottom set value and a second bottom set value whose temperature is higher than the first bottom set value, and is detected by the first temperature detecting means. It is preferable to change the setting of the first boiling completion time based on the time required for the temperature to rise from the first bottom set value to the second bottom set value.
In the second boiling determination step, the first horizontal set value and a second horizontal set value having a temperature higher than the first horizontal set value are provided, and the temperature detected by the first temperature detecting means is the first horizontal set value. It is preferable to change the setting of the second boiling completion time based on the time required to raise the temperature from the set value to the second lateral set value.
In this way, the liquid capacity accommodated in the container can be determined, and the boiling completion time can be set accordingly. Therefore, the heating means can be stopped more reliably in the boiling state, and overheating can be prevented.

  In these first and second heating containers, the control means executes an abnormality detection process for detecting the presence or absence of abnormality of at least the first or second temperature detection means in parallel with the boiling process, and in this abnormality detection process, Judging by comparing the detected temperature by the first temperature detecting means and the detected temperature by the second temperature detecting means with a preset abnormality determination value after a preset standby time has elapsed after the start of the boiling process. Is preferred. When it is determined that there is an abnormality, it is preferable to stop the heating means and execute a notification process for notifying the user of the abnormal state. By doing so, it is possible to prevent overheating due to failure of the temperature detecting means, and thus safety can be ensured.

  In the heating container of the present invention, it is possible to detect a substantially accurate liquid temperature without being affected by the heat of the heating means, by the second temperature detection means disposed on the upper outer surface of the container. In addition, the first boiling judgment step by the first temperature detection means and the second boiling judgment step by the second temperature detection means are processed in parallel, and the boiling completion time set in one of the boiling judgment steps is applied and the boiling is performed. When the completion time elapses, the boiling process is stopped. Therefore, even if an error occurs in the temperature detected by the first or second temperature detecting means due to the amount of water or the usage environment, the heating means can be reliably stopped in a boiling state to prevent overheating.

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

  FIG. 1 shows an electric pot that is a heating container according to an embodiment of the present invention. The electric pot is configured such that a lid 14 is openable and closable at the top of the pot body 10, and a bottom temperature sensor 24 disposed at the bottom of the container 17 and a lateral temperature disposed at the top of the outer surface of the container 17. The sensor 25 is used to detect the boiling state in normal boiling processing and re-boiling processing.

  The pot body 10 has a cylindrical metal body 11, a resin shoulder 12 disposed in the upper end opening of the body 11, and a resin bottom body 13 disposed in the lower end opening of the body 11. The exterior body which consists of is provided. Among them, on the back side of the shoulder body 12, a hinge connection portion 15 is provided for attaching the lid body 14 that seals the upper end opening of the container 17 so as to be opened and closed. Further, a nose portion 16 is provided on the front side facing the hinge connection portion 15.

  Inside the exterior body, a container 17 for storing liquid, heaters 22 and 23 as heating means, and a pair of temperature sensors 24 and 25 as temperature detection means are arranged. A cylindrical heat insulating member 28 and end heat insulating members 31 </ b> A and 31 </ b> B are disposed on the outer periphery of the container 17. Further, at the bottom of the container 17, a pump 32 that is a hot water supply means for the liquid (water) inside is disposed.

  The container 17 has a single-layer bottomed cylindrical shape with an upper end opened and a lower end closed, and the opening end is attached to the opening of the shoulder body 12. At the bottom of the container 17, a heater disposing portion 18 for disposing the heaters 22 and 23 is provided so as to bulge upward. In the center of the heater disposing portion 18, a bottom abutting portion 19 for disposing a bottom temperature sensor 24 is further provided so as to bulge upward. Moreover, the water level line 20 which shows the position of the rated full water volume of the container 17 is provided in the outer surface upper part of the container 17 so that it may be located in the hinge connection part 15 side in an assembly | attachment state. Further, a lateral contact portion 21 in which the lateral temperature sensor 25 is disposed is provided on the outer surface upper portion of the container 17 so as to be positioned on the nose portion 16 side. The lateral contact portion 21 is formed in a planar shape extending in parallel with a tangent to the outer peripheral surface in plan view so as to be positioned at substantially the same height as the water level line 20.

  A boiling heater 22 serving as a first heating unit and a heat retaining heater 23 serving as a second heating unit are stacked in an upward direction on the heater arrangement portion 18 of the container 17. The boiling heater 22 is operated (energized) during the boiling process and the re-boiling process. The heat retaining heater 23 is operated during the heat retaining process.

  The bottom contact portion 19 of the container 17 is provided with a bottom temperature sensor 24 made of a thermistor as a first temperature detecting means. Further, the lateral contact portion 21 is provided with a lateral temperature sensor 25 made of a thermistor as a second temperature detecting means. These temperature sensors 24, 25 detect the internal liquid temperature via the wall surface of the container 17, and are biased in the axial direction so as to be in surface contact with the respective contact portions 19, 21. It is arranged by. As shown in FIG. 2, the lateral temperature sensor 25 is provided with a mounting bracket 26 with respect to the shoulder body 12, and a coil spring 27 that is a biasing means between the mounting bracket 26 and the lateral contact portion 21. By being disposed via the, the lateral contact portion 21 is disposed in a biased state.

  As shown in FIG. 1, the tubular heat insulating member 28 includes an inner tubular member 29 and an outer tubular member 30, and is composed of a vacuum double jacket in which both end edges are joined and the inner space is evacuated. The end heat insulating members 31A and 31B are made of a material having low thermal conductivity such as urethane and having elasticity. The end heat insulating members 31 </ b> A and 31 </ b> B are disposed between the container 17 and the tubular heat insulating member 28 so as to be positioned at substantially upper and lower ends of the outer surface of the container 17. Accordingly, the lateral temperature sensor 25 is disposed in a space surrounded by the tubular heat insulating member 28 and the end heat insulating members 31A and 31B. As a result, at the time of boiling treatment and re-boiling treatment, it is possible to avoid the influence of heat from the boiling heater 22 that becomes high temperature.

  As shown in FIG. 2, the pump 32 is disposed in a water passage hole (not shown) provided on the outer periphery of the bottom of the container 17. A pumping pipe 33 is connected to the discharge side of the pump 32, and the pumping pipe 33 is connected to a bend set 34 disposed on the nose portion 16 of the shoulder body 12. When the pump is operated, the liquid in the container 17 is supplied to the vent set 34 via the pumping pipe 33 and discharged from the discharge port 35 of the vent set 34.

  An operation panel portion 36 is provided on the nose portion 16 of the shoulder body 12. As shown in FIG. 3, the operation panel unit 36 includes a liquid crystal display 37 that displays a selection state of the temperature of the hot water in the container 17 and the heat retention set temperature. Around the liquid crystal display 37, a hot water supply switch 38, a lock release switch 39, a re-boiling switch 40, a heat retention setting switch 41, and a timer switch 42 are provided. Further, in the vicinity of the lock release switch 39, there is provided an unlock display 43 composed of LEDs indicating that the hot water of the liquid in the container 17 can be supplied by operating the hot water switch 38.

  In the electric pot configured as described above, a substrate case 44 is disposed at the bottom of the container 17, and a control substrate 45 is disposed in the substrate case 44 together with the power supply unit. And it is controlled by the microcomputer 46 which is a control means mounted on the control board 45. Specifically, the microcomputer 46 supplies the liquid in the container 17 when power is turned on by connecting a power cord (not shown) to the commercial power source or based on the detected temperature input from the bottom temperature sensor 24. A normal boiling process for boiling is performed, followed by a heat retaining process. Further, when the operation of the reboiling switch 40 of the operation panel unit 36 is detected during the heat retaining process, the reboiling process for boiling again the liquid being kept warm is performed, and the heat retaining process is subsequently performed.

  In the normal boiling process (second invention) of the present embodiment, a first normal boiling determination step based on the detected temperature Tb of the bottom temperature sensor 24 and a second normal boiling determination based on the detected temperature Ts of the lateral temperature sensor 25. Process and process in parallel. In each normal boiling determination step, the boiling state is determined in each step, and normal boiling completion times tn1, tn2 are set in each step. Of the normal boiling completion times tn1 and tn2 set in each process, the normal boiling completion times tn1 and tn2 having a short heating time are adopted, and the heating by the boiling heater 22 is stopped when the normal boiling completion times tn1 and tn2 have elapsed. It is configured to do.

  In the first normal boiling determination step, it is determined that the boiling is completed when the detected temperature Tb of the bottom temperature sensor 24 is equal to or higher than a preset bottom set value, and the remaining heating time, that is, the first normal boiling completion time is determined. Set tn1. In the present embodiment, in order to change the setting of the first normal boiling completion time tn1 in accordance with the heating capacity, the first bottom set value Tbn1 (about 92 ° C.) and the temperature higher than the first bottom set value Tbn1 A two-bottom setting position Tbn2 (about 98 ° C.) is preset. Then, based on the time tb required for the temperature Tb detected by the bottom temperature sensor to rise from the first bottom set value Tbn1 to the second bottom set value Tbn2, the heating capacity is determined, and based on the predicted heating capacity The first normal boiling completion time tn1 is set. Incidentally, the first normal boiling completion time tn1 is long when the capacity is large and short when the capacity is small.

  Similarly, in the second normal boiling determination step, when the detected temperature Ts of the horizontal temperature sensor 25 is equal to or higher than a preset horizontal set value, it is determined that the boiling has been completed, and the remaining heating time, that is, the completion of the second normal boiling is completed. Time tn2 is set. Then, in order to change the setting of the second normal boiling completion time tn2 according to the heating capacity, the first horizontal set value Tsn1 (about 90 ° C.) and the second horizontal set position Tsn2 whose temperature is higher than the first horizontal set value Tsn1. (About 95 ° C.) is preset. Then, based on the time ts required for the temperature Ts detected by the lateral temperature sensor 25 to rise from the first lateral setting value Tsn1 to the second lateral setting value Tsn2, the heating capacity is determined, and the predicted heating capacity is obtained. Based on this, the second normal boiling completion time tn2 is set. Of course, the second normal boiling completion time tn2 is long when the capacity is large and short when the capacity is small.

  In the reboiling process (first invention) of the present embodiment, the first reboiling determination step based on the detected temperature Tb of the bottom temperature sensor 24 and the detected temperature of the lateral temperature sensor 25 are performed as in the normal boiling process. The second reboiling determination step based on Ts is processed in parallel. In each re-boiling determination step, the boiling state is determined in each step, and re-boiling completion times tr1 and tr2 are set in each step. In the re-boiling process, when the determination condition is satisfied in the second re-boiling determination step, the heating by the boiling heater 22 is stopped when the second re-boiling completion time tr2 set in the second re-boiling determination step elapses. Let On the other hand, when the determination condition is not satisfied in the second reboiling determination step, the heating by the boiling heater 22 is stopped when the first reboiling completion time tr1 set in the first reboiling determination step elapses.

  In the first re-boiling determination step, when the detected temperature Tb of the bottom temperature sensor 24 is equal to or higher than a preset bottom set value Tbr (98 ° C.), it is determined that the boiling has been completed, and the remaining heating time, that is, the first heating time, 1 Re-boiling completion time tr1 is set. In the present embodiment, in order to prevent the first re-boiling completion time tr1 from being overheated, the first re-boiling is completed based on the detected temperature Tb of the bottom temperature sensor 24 immediately after execution (start) of the re-boiling process. The configuration is such that the setting of the time tr1 is changed.

  In the second reboiling determination step, the first to third determinations are executed based on the detected temperature Ts of the lateral temperature sensor 25, and the second reboiling completion time tr2 is set when all the conditions are satisfied. . On the other hand, when the second determination is not satisfied, that is, when all the conditions are not satisfied, the second re-boiling completion time tr2 is not set.

  Specifically, in the first determination, the temperature Ts is detected by the lateral temperature sensor 25 every predetermined time (0.5 seconds), and the maximum value and the minimum value of the accumulated (for example, 20) temperature information are determined. The temperature rise is calculated from the temperature difference. And it waits until it detects four times continuously that the rise degree of the temperature became more than preset judgment value H (1 degreeC). For example, when the sampling of the detected temperature Ts by the lateral temperature sensor 25 is started and the 20th temperature detection is performed, the first comparison judgment is performed. Thereafter, when the temperature detection is performed for the 21st time, the temperature information for the first time is discarded, and a comparison determination is made based on 20 pieces of temperature information from the second time to the 21st time. In addition, when the 22nd temperature detection is performed, the second temperature information is discarded, and the comparison determination is performed based on 20 pieces of temperature information from the 3rd time to the 22nd time. This is repeated, and when the degree of increase exceeds the determination value H for four consecutive times, the process proceeds to the second determination.

  The second determination is to determine whether or not the temperature Tb detected by the bottom temperature sensor 24 when the first determination is satisfied is equal to or higher than a preset bottom reference value TBb. Then, when the detected temperature Tb is equal to or higher than the bottom reference value TBb, the process proceeds to the third determination, and when the detected temperature Tb is lower than the bottom reference value TBb, the second reboil determination step is stopped.

  The third determination waits until the detected temperature Ts of the lateral temperature sensor 25 detects the lateral reference value TBs or more when the first and second determinations are established. When the detected temperature Ts becomes equal to or higher than the horizontal reference value TBs, the second re-boiling completion time tr2 is set.

  Furthermore, in this embodiment, it is set as the structure which performs the sensor abnormality detection process which detects the presence or absence of abnormality of an electric pot in parallel with a normal boiling process. In this sensor abnormality detection process, after a predetermined standby time (3 minutes) has elapsed after the start of the normal boiling process, the detected temperature Ts by the bottom temperature sensor 24 and the detected temperature Ts by the lateral temperature sensor 25 are set in advance. The determination is made by comparing with the abnormality determination values TEb1 and TEs1. Specifically, the detection temperature Ts detected by the bottom temperature sensor 24 is equal to or lower than the bottom lower limit abnormality determination value TEb1 (85 ° C.), the detection temperature Ts detected by the lateral temperature sensor 25 is equal to or greater than the lateral upper limit abnormality determination value TEs1 (95 ° C.), If this state continues for 5 seconds, it is determined that the bottom temperature sensor or the lateral temperature sensor 25 has failed, and heating by the boiling heater 22 is stopped.

  Moreover, in this embodiment, the lid opening abnormality detection process is executed in parallel with the heat retention process. Specifically, during the heat retention process, the detected temperature Tb of the bottom temperature sensor 24 is equal to or higher than the bottom upper limit abnormality determination value TEb2 (boiling start temperature 85 ° C.), and the detected temperature Ts of the lateral temperature sensor 25 is determined to be the lateral lower limit abnormality. When the value TEs2 (65 ° C.) or less is detected, it is determined that the container 17 is not sealed by the lid 14, and a piezoelectric buzzer (not shown) mounted on the control board 45 is operated to operate the user. It is set as the structure which alert | reports to.

  Next, the control by the microcomputer 46 will be specifically described.

  When the user connects the power cord to the commercial power source, the microcomputer 46 first determines whether or not the detected temperature Tb of the bottom temperature sensor 24 is lower than the boiling start temperature in step S1, as shown in FIG. .

  When the detected temperature Tb is lower than the boiling start temperature, the normal boiling process in step S2 and the sensor abnormality detection process in step S3 are performed in parallel. These processes will be described later in detail.

  When the detected temperature Tb is equal to or higher than the boiling start temperature in step S1 and when the normal boiling process and the sensor abnormality detection process are completed, the heat retention process in step S4 and the lid opening abnormality detection process in step S5 are performed in parallel. . Note that the heat retaining process is to perform a heat retaining process in which the heat retaining heater 23 is turned on / off based on the temperature Tb detected by the bottom temperature sensor 24 to adjust the temperature to the heat retaining temperature set by the user.

  When the heat retention process and the lid opening abnormality detection process are completed, it is detected in step S6 whether or not the reboiling switch 40 has been operated. When the operation of the reboiling switch 40 is detected, the reboiling process of step S7 is executed, and when the operation of the reboiling switch 40 is not detected, the process returns to step S1. When the re-boiling process is completed, the process returns to step S1.

  Next, the normal boiling process in step S2 will be specifically described.

  In this normal boiling process, as shown in FIG. 5, the microcomputer 46 first starts heating by energizing the boiling heater with full power in step S2-1. Thereafter, the first normal boiling determination process from step S2-2 to step S2-7 and the second normal boiling determination process from step S2-8 to step S2-13 are performed in parallel.

  First, in the first normal boiling determination process, in step S2-2, the process waits until the detected temperature Tb of the bottom temperature sensor 24 becomes the first bottom set value Tbn1. When the detected temperature Tb reaches the first bottom set value Tbn1, the measurement timer is reset and started in step S2-3, and then in step S2-4, the detected temperature Tb of the bottom temperature sensor 24 is set to the second bottom value. Wait until the set value Tbn2 is reached. When the detected temperature Tb reaches the second bottom set value Tbn2, the measurement timer is stopped in step S2-5, and then in step S2-6, the first normal boiling completion time tn1 is set based on the measurement time tb. Execute the process. Thereafter, in step S2-7, measurement of the set first normal boiling counter is started, and the process proceeds to step S2-14.

  On the other hand, in the second normal boiling determination process, in step S2-8, the process waits until the detected temperature Ts of the lateral temperature sensor 25 becomes the first lateral set value Tsn1. When the detected temperature Ts reaches the first lateral set value Tsn1, the measurement timer is reset and started in step S2-9, and then in step S2-10, the detected temperature Ts of the lateral temperature sensor 25 is changed to the second lateral set value Tsn1. Wait until the set value Tsn2 is reached. When the detected temperature Ts reaches the second lateral set value Tsn2, the measurement timer is stopped in step S2-11, and then in step S2-12, the second normal boiling completion time tn2 is set based on the measurement time ts. Execute the process. Thereafter, in step S2-13, measurement of the set second normal boiling counter is started, and the process proceeds to step S2-14.

  In step S2-14, it is determined whether or not the first normal boiling counter has been counted up. If the first normal boiling counter has not been counted up, the process proceeds to step S2-15, and if it has been counted up, the process proceeds to step S2-16. In step S2-15, it is determined whether or not the second normal boiling counter has been counted up. If the second normal boiling counter has not been counted up, the process returns to step S2-15, and if it has been counted up, the process proceeds to step S2-16. That is, when the one with the shorter set time among the first and second normal boiling counters counts up, the process proceeds to step S2-16. And in this step S2-16, electricity supply to the boiling heater 22 is interrupted | blocked, a heating is stopped and it returns.

  In addition, the boiling detection flow by this normal boiling process is as showing in FIG. That is, the bottom temperature sensor 24 detects a temperature Tb higher than the actual hot water temperature due to the influence of the heat of the boiling heater 22 in the vicinity. On the other hand, since the lateral temperature sensor 25 is separated from the boiling heater 22 and is partitioned by the heat insulating members 28, 31A, and 31B, it is not affected by heat due to heating. Moreover, since the hot water temperature is detected through the wall surface of the container 17 made of a material having low thermal conductivity, the temperature Ts lower than the actual hot water temperature is detected. For this reason, in the normal boiling process, the correction of the hot water temperature is determined by adding correction data of the temperature difference found through intensive experiments to the actual detected temperatures Tb and Ts.

  Accordingly, in the normal boiling process, first, the first bottom set value Tbn1 is detected via the bottom temperature sensor 24, and then the second bottom set value Tbn2 is detected. At this time, the first normal boiling completion time tn1 is set by multiplying the time tb required for temperature increase by a preset coefficient α to start counting. Thereafter, the first lateral set value Tsn1 is detected via the lateral temperature sensor 25, and then the second lateral set value Tsn2 is detected. At this time, the second normal boiling completion time tn2 is set by multiplying the time ts required for temperature increase by a preset coefficient β, and the counting is started.

  Here, each temperature sensor 24, 25 has a larger detection error at the detection temperature Tb of the bottom temperature sensor 24, which is greatly affected by heat. Therefore, the coefficient α for setting the first normal boiling completion time tn1 needs to be set with a margin so that the boiling state is surely achieved. On the other hand, the detected temperature ts of the lateral temperature sensor 25 is not affected by the heat of the boiling heater 22 and has a small detection error. Therefore, the coefficient β for setting the second normal boiling completion time tn2 can be set almost accurately as found by experiments. Therefore, in most cases, the time from the start of the normal boiling process until the normal boiling completion time tn1, tn2 elapses is shorter until the second normal boiling completion time tn2 elapses.

  On the other hand, in the present embodiment, the pair of temperature sensors 24 and 25 are used and the boiling determination process is performed independently. Therefore, even if one of the temperature sensors 24 and 25 fails, the other temperature sensor 24 can be used. , 25, when the normal boiling completion time tn1, tn2 elapses, the boiling process can be completed.

  Next, the sensor abnormality detection process in step S3 will be described.

  This sensor abnormality detection process is configured to detect a state where the possibility of overheating by the boiling heater 22 is high. That is, as shown in FIG. 7, when the bottom temperature sensor 24 fails in the low temperature (below 85 ° C.) detection state in which the normal boiling process is started while the heat retention process is being performed, if the low temperature is detected (step S1), A boiling process is started (step S2). As a result, the liquid in the container is heated and the detected temperature Ts of the lateral temperature sensor 25 that has not failed gradually increases, but the detected temperature Tb of the malfunctioning lateral temperature sensor 25 does not increase. For this reason, the normal boiling process can be ended based on the detected temperature Ts of the lateral temperature sensor 25, but the normal boiling process is resumed as soon as the process is completed and the process proceeds to the heat retaining process.

  Therefore, in the present embodiment, during the normal boiling process, the bottom temperature sensor 24 detects a temperature Tb that is equal to or lower than the bottom lower limit abnormality determination value TEb1, and the lateral temperature sensor 25 detects a temperature Ts that is equal to or greater than the lateral upper limit abnormality determination value TEs1. If the detection time continues for a preset abnormality determination time (5 seconds), it is determined that there is an abnormality, and heating by the boiling heater 22 is stopped. Incidentally, when the user opens the lid 14 and adds water to the container 17, the bottom temperature sensor 24 detects the temperature Tb below the bottom lower limit abnormality determination value TEb1 within the detection waiting time, and the lateral temperature sensor 25 May detect a temperature Ts that is equal to or greater than the lateral upper limit abnormality determination value TEs1. Therefore, the normal boiling process is started, and the presence or absence of abnormality is determined by satisfying the temperature condition after the detection standby time has elapsed.

  Thereby, in this embodiment, the safety | security at the time of the bottom temperature sensor 24 failing in the state which showed the bottom lower limit abnormality determination value TEb1 or less is securable. If the bottom temperature sensor 24 fails in a state where a temperature higher than the bottom lower limit abnormality determination value TEb1 is detected, there is no problem in terms of safety because the heat retaining process is not shifted to the normal boiling process. In addition, since the heat retaining process does not perform control based on the detected temperature Ts of the lateral temperature sensor 25, there is no problem in safety even if the lateral temperature sensor 25 is out of order. Furthermore, with the above configuration, as shown in FIG. 8, it is possible to detect a case where the lateral temperature sensor 25 fails during the normal boiling process in a state where the lateral upper limit abnormality determination value TEs1 or more is shown.

  Next, the lid opening abnormality detection process in step S5 will be described.

  As shown in FIG. 9, during the heat retaining process, the user may open the lid 14 and directly check the remaining amount in the container 17. As described above, when the lid 14 is opened and closed during the heat retaining process, the detected temperature Ts of the lateral temperature sensor rapidly decreases due to opening, and then rapidly increases due to sealing. However, when the user does not close the lid body 14 in the normal state, the detected temperature Ts of the lateral temperature sensor 25 continues to decrease with a steep slope. On the other hand, the detected temperature Tb of the bottom temperature sensor 24 decreases with a gentle downward gradient due to the heat of the heat retaining heater 23 and the liquid temperature during the heat retaining.

  Therefore, in the present embodiment, during the heat retaining process, the detected temperature Tb of the bottom temperature sensor 24 detects the bottom upper limit abnormality determination value TEb2 or more, and the detected temperature Ts of the lateral temperature sensor 25 detects the lower limit abnormality determination value TEs2 or less. In such a case, it is determined that the lid is open abnormally (closed failure) and the notification process is executed. Therefore, misuse by the user can be reliably prevented.

  Next, the re-boiling process in step S7 will be described.

  In this re-boiling process, as shown in FIG. 10, the microcomputer 46 first starts heating by energizing the boiling heater with full power in step S7-1. Thereafter, the first reboil determination process from step S7-2 to step S7-5 and the second reboil determination process from step S7-6 to step S7-14 are processed in parallel.

  First, in the first reboiling determination process, after the temperature Tb0 detected by the bottom temperature sensor 24 is stored in step S7-2, the temperature Tb detected by the bottom temperature sensor 24 becomes the bottom set value Tbr in step S7-3. Wait until. When the detected temperature Tb reaches the bottom set value Tbr, in step S7-4, the first re-boiling completion time tr1 is set based on the stored detected temperature Tb0 at the beginning of the re-boiling process. Thereafter, in step S7-5, measurement of the set first reboiling counter is started, and the process proceeds to step S7-15.

  On the other hand, in the second reboiling determination process, a first determination based on the detected temperature Ts of the lateral temperature sensor 25 is executed in step S7-6. As described above, this first determination waits until four consecutive times that the degree of increase in the detected temperature Ts by the lateral temperature sensor 25 has reached the determination value H or more are detected. In step S7-7, if the condition based on the first determination is satisfied (cleared), the process proceeds to step S7-8. If not satisfied, the process returns to step S7-6.

  In step S7-8, the second determination based on the detected temperature Tb of the bottom temperature sensor 24 is executed. This second determination is to determine whether or not the temperature Tb detected by the bottom temperature sensor 24 is equal to or higher than the bottom reference value TBb as described above. If the detected temperature Tb is not equal to or higher than the bottom reference value TBb, the process proceeds to step S7-10, where 1 is input (not satisfied) to the flag f indicating whether the condition is satisfied, Steps S7-11 to S7-14 are skipped and the process proceeds to step S7-15. If the detected temperature Tb is equal to or higher than the bottom reference value TBb, the process proceeds to step S7-11.

  In step S7-11, the third determination based on the detected temperature Ts of the lateral temperature sensor 25 is executed. As described above, this third determination is to wait until the temperature Ts detected by the lateral temperature sensor 25 becomes equal to or higher than the lateral reference value TBs. In step S7-12, if the condition based on the third determination is satisfied, the process proceeds to step S7-13. If not satisfied, the process returns to step S7-11.

  In step S7-13, a preset second reboiling completion time tr2 is set. Thereafter, in step S7-14, the measurement of the set second reboiling counter is started, and the process proceeds to step S7-15.

  In step S7-15, it is detected whether f is 0 or not. When f is 0 (when the condition is satisfied in the second reboil determination step (including determination)), the process proceeds to step S7-16, and when f is 1 (second reboil determination step) If the condition is not satisfied), the process proceeds to step S7-17.

  In step S7-16, it is determined whether or not the second reboiling counter has been counted up. Then, if the second reboiling counter has counted up, the process proceeds to step S7-19. If the second reboiling counter has not been counted up, and if the second reboiling counter is not counting, It returns to step S7-15.

  Step S7-17 is a case where the condition is not satisfied in the second reboil determination step. In this case, the process waits until the first reboil counter is counted up. When the first reboiling counter counts up, in step S7-18, 0 is input to f, and the flow proceeds to step S7-19.

  In step S7-19, the energization to the boiling heater 22 is cut off, the heating is stopped, and the process returns.

  In addition, the boiling detection flow by this reboiling process is as showing in FIG.

  First, the bottom set value Tbr is detected via the bottom temperature sensor 24, whereby the first re-boiling completion time tr1 is set based on the detected temperature Tb0 immediately after the start of re-boiling, and counting is started. Further, when the detected temperature Ts is sampled by the lateral temperature sensor 25 and it is detected that the degree of increase is equal to or higher than the determination value H four times in succession, the second and third determinations are subsequently performed. If established, a preset second re-boiling completion time tr2 is set, and counting is started.

  As described above, the electric pot of the present embodiment is based on the first boiling determination step based on the detected temperature Tb of the bottom temperature sensor and the detected temperature Ts of the lateral temperature sensor 25 in both the normal boiling process and the reboiling process. The second boiling judgment step is processed in parallel. In the normal boiling process, the heating by the boiling heater 22 is stopped when the shorter heating time of the boiling completion times tn1 and tn2 set in each boiling determination step elapses. In the re-boiling process, when the determination condition in the second boiling determination step is satisfied, the boiling heater 22 is stopped after the second boiling completion time tr2 has elapsed, and the determination condition in the second boiling determination step is not satisfied. In this case, the boiling heater 22 is stopped after the first boiling completion time tr1 has elapsed. Therefore, even if an error occurs in the detected temperature due to the amount of water or the usage environment, heating can be reliably stopped in a boiling state, and excessive heating can be prevented.

  In the normal boiling process, the boiling completion times tn1 and tn2 are set based on the times tb and ts required to raise the temperature from the first set value to the second set value. That is, the liquid capacity accommodated in the container 17 can be determined, and the boiling completion times tn1 and tn2 can be set accordingly. Therefore, the heating can be stopped more reliably in the boiling state, and excessive heating can be prevented.

  Furthermore, in the reboiling process, after the first determination based on the detected temperature Ts of the lateral temperature sensor 25 is established in the second boiling determination step, the second determination based on the detected temperature Tb of the bottom temperature sensor 24 is performed. . And when this 2nd judgment is materialized, when the 2nd boiling completion time tr2 set at the 2nd boiling judgment process with little difference from actual hot water temperature passes, heating will be stopped. Moreover, in the present embodiment, the third determination based on the detected temperature Ts of the lateral temperature sensor 25 is further executed, and when this third determination is established, the second boiling completion time tr2 is set. Therefore, insufficient heating can be prevented.

  On the other hand, if the second determination is not satisfied, the boiling heater 22 is stopped after the first boiling completion time tr1 set in the first boiling determination step. Therefore, when the lateral temperature sensor 25 is out of order, the boiling detection can be performed only by the bottom temperature sensor 24, so that safety can be further improved. Moreover, in the first boiling judgment step, the first boiling completion time tr1 is set based on the detected temperature Tb0 immediately after the start of the reboiling process, so that the purpose of boiling is reliably achieved without excessive heating in the reboiling process. it can.

  Further, in the normal boiling process, the sensor abnormality detection process is performed in parallel, and it is configured to prevent overheating due to the failure of one of the temperature sensors 24, 25, so that the safety of the product can be ensured. Moreover, since the lid opening abnormality detection process is performed in parallel in the heat retaining process, it is possible to notify the user of the misuse state, and the convenience can be improved.

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

  For example, in the above-described embodiment, in the normal boiling process, in both the first and second boiling determination steps, the pair of set values Tbn1 and Tbn2, Tsn1 and Tsn2 are set, and the boiling is completed based on the temperature rising times tb and ts. Although the time tn1 and tn2 are set, the same configuration as the reboiling process may be used.

  Further, in the first determination of the embodiment, when the degree of increase in the detected temperature Ts of the lateral temperature sensor 25 is continuously detected four times or more than the determination value H, it is determined that the condition is satisfied. It may be determined that the condition is satisfied by only one detection.

  Furthermore, in the said embodiment, although the electric pot was applied and demonstrated as a heating container of this invention, it is applicable also to the humidifier which supplies the vapor | steam generated from the heated hot water indoors, and the same effect | action and effect are applied. Obtainable.

It is sectional drawing which shows the electric pot which is a heating container of embodiment which concerns on this invention. It is a perspective view which shows the internal structure of an electric pot. It is a block diagram which shows the operation panel part and other structure of an electric pot. It is a flowchart which shows the control by a microcomputer. It is a flowchart which shows the normal boiling process of FIG. It is a time chart which shows the boiling detection flow of the normal boiling process of FIG. It is a time chart which shows the case where a bottom temperature sensor fails during a heat retention process. It is a time chart which shows the case where a lateral temperature sensor fails during a normal boiling process. It is a time chart which shows the case where a cover body is open | released during a heat retention process. It is a flowchart which shows the reboiling process of FIG. It is a time chart which shows the boiling detection flow of the reboiling process of FIG.

Explanation of symbols

10 ... Pot body (heating container)
14 ... Lid 17 ... Container 22 ... Boiling heater (heating means)
23 ... Insulating heater 24 ... Bottom temperature sensor (first temperature detecting means)
25 ... Lateral temperature sensor (second temperature detecting means)
32 ... Pump 46 ... Microcomputer (control means)

Claims (6)

A container containing a liquid;
Heating means disposed at the bottom of the container;
First temperature detecting means disposed on the bottom of the container;
Second temperature detection means disposed on the outer surface of the container;
Control means for controlling the heating means based on the detected temperatures of the first and second temperature detecting means to perform a boiling process for heating the liquid,
In boiling treatment by the control means,
A first boiling judgment step of setting a first boiling completion time when the detected temperature of the first temperature detecting means is equal to or higher than a preset bottom set value;
When it is detected at least once that the degree of increase in the detected temperature of the second temperature detecting means is equal to or higher than a preset determination value, the detected temperature of the first temperature detecting means is equal to or higher than a preset bottom reference value. A second boiling judgment step for setting a second boiling completion time after waiting until the detected temperature of the second temperature detecting means further detects the horizontal reference value or more ,
In the second boiling determination step, when the temperature detected by the first temperature detection means is equal to or higher than the bottom reference value, the heating by the heating means is stopped when the second boiling completion time has elapsed, When the temperature detected by the one temperature detecting means is lower than the bottom reference value, heating by the heating means is stopped when the first boiling completion time has elapsed. 2. The heating container according to claim 1, wherein, in the first boiling determination step, the setting of the first boiling completion time is changed based on the temperature detected by the first temperature detection unit immediately after the boiling process is performed. A container containing a liquid;
Heating means disposed at the bottom of the container;
First temperature detecting means disposed on the bottom of the container;
Second temperature detection means disposed on the outer surface of the container;
Control means for controlling the heating means based on the detected temperatures of the first and second temperature detecting means to perform a boiling process for heating the liquid,
In boiling treatment by the control means,
A first boiling judgment step of setting a first boiling completion time when the detected temperature of the first temperature detecting means is equal to or higher than a preset bottom set value;
A second boiling determination step of setting a second boiling completion time when the detected temperature of the second temperature detecting means is equal to or higher than a preset lateral set value;
The heating container is characterized in that heating by the heating means is stopped when a boiling completion time with a short heating time has elapsed among these boiling determination steps. The first boiling determination step includes a first bottom set value and a second bottom set value having a temperature higher than the first bottom set value, and the temperature detected by the first temperature detecting means is the first bottom set value. 4. The heating container according to claim 3 , wherein the setting of the first boiling completion time is changed based on a time required to raise the temperature from 1 to the second bottom set value. In the second boiling judgment step, the first horizontal set value and a second horizontal set value having a temperature higher than the first horizontal set value are detected, and the temperature detected by the first temperature detecting means is the first horizontal set value. 5. The heating container according to claim 3 , wherein the setting of the second boiling completion time is changed based on the time required to raise the temperature from 1 to the second lateral set value. The control means executes an abnormality detection process for detecting the presence or absence of abnormality of at least the first or second temperature detection means in parallel with the boiling process,
In this abnormality detection process, the temperature detected by the first temperature detection unit and the temperature detected by the second temperature detection unit are compared with a predetermined abnormality determination value after a preset standby time has elapsed after the start of the boiling process. The heating container according to any one of claims 3 to 5, wherein the determination is made based on the above.

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